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  <xs:element id="phin_ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" abstract="true" name="ScheduleOfFiniteAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="phin_StandardProductWarrantyWarrantyTerm" abstract="false" name="StandardProductWarrantyWarrantyTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="phin_SeniorSecuredNotesAprilDue2029Member" abstract="true" name="SeniorSecuredNotesAprilDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_SeniorNotesDueOctober2032Member" abstract="true" name="SeniorNotesDueOctober2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_SeniorNotesDueOctober2025Member" abstract="true" name="SeniorNotesDueOctober2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_TermLoanATermLoanBFacilityMember" abstract="true" name="TermLoanATermLoanBFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_CreditAgreementMember" abstract="true" name="CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_DebtIncreaseDecreaseBetweenFairValueAndCarryingValue" abstract="false" name="DebtIncreaseDecreaseBetweenFairValueAndCarryingValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_CustomerRelatedLiability" abstract="false" name="CustomerRelatedLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_AccruedUncertainTaxPositions" abstract="false" name="AccruedUncertainTaxPositions" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_AccruedFreight" abstract="false" name="AccruedFreight" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_AccruedSupplierItems" abstract="false" name="AccruedSupplierItems" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_DeferredEngineeringReimbursementsCurrent" abstract="false" name="DeferredEngineeringReimbursementsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromHedgesBeforeTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromHedgesBeforeTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_StockholdersEquityTable" abstract="true" name="StockholdersEquityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="phin_StockIssuedDuringPeriodValueStockOptionsExecutiveStockPlanIssuanceNet" abstract="false" name="StockIssuedDuringPeriodValueStockOptionsExecutiveStockPlanIssuanceNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_CustomerMember" abstract="true" name="CustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_IntersegmentMember" abstract="true" name="IntersegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="phin_SegmentReportingCorporateAllocation" abstract="false" name="SegmentReportingCorporateAllocation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_RestructuringChargesNetOfCashPaid" abstract="false" name="RestructuringChargesNetOfCashPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="phin_IncreaseDecreaseInPrepaidTaxesAndIncomeTaxesPayable" abstract="false" name="IncreaseDecreaseInPrepaidTaxesAndIncomeTaxesPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
