What was found
#1 ENG SHORT TERM DISPATCH MSG ON POWERUP WITH FAULT SD OBV CMD-CURRENT DISAGREE CODE 73216422E1B. REMOVED #1 ENGINE FADES REF E175 AMM TASK 73-21-01-000-801-A BEGAN INSTALLATION OF #1 ENGINE FADEC REF E175 AMM TASK 73-21-01-400-801-A PARA 1-8J. UPON POWER UP FAULT RETURNED. CHECKED RESISTANCE AT FADEC CONNECTOR P3 AND P4, PINS X AND Y TO OBV. RESISTENCE WAS 40 OHMS ( RANGE IS 30-50 OHMS). REF GE FIM 72-00-00-810-808. NO DEFECTS NOTED. COMPLETED FADEC INSTALLATION IAW AMM TASK 73-21-01-400-801-A PAR 8K-N. REMOVED & INSTALLED PBV IAW GE LMM TASK 75-00-00-800-807. OPS CHECKS GOOD NO LEAKS NOTED. FAULT DID NOT RETURN.