What was found
AFTER LEFT ENGINE START, ELECTRICAL FAULT LT FBW PC PMG INOPERATIVE. T/S IAW EFIM, FAULT CODE 2401F3249, RELAY PREVIOUSLY CHANGED, WIRING CHECK FOR PINS X1 & X2 AT K17 RELAY OK, WIRING CHECK FROM A276P1 PIN 1 TO 38 SHOWS 28 VDC. R & R CDC1 LRM09 IAW AMP 24- 01-25. FAULT CONFIRMATION STILL SHOWS CASS MESSAGE FOR ELECTRICAL FAULT & INFO MESSAGE FOR LT FWB PC PMG INOP. LRU OPS MAINT PAGE SHOWS FAULT CODE 2401F3249 & 2401F3247. END OF EFIM PROCEDURE FOR FAULT CODE 2401F3249. REAPPLIED M PROC, CONTINUE ON MEL. REPLACED IIM NR 1 IAW AMP 27-04-01 ALL TESTED GOOD ON BOX, LT PMG INOPERATIVE MESSAGE CAME BACK. FOUND WIRE WPC0001 -EIP 12WH, WPC0001-EIP-12B2 AND WPC0001-E1P-120R SHORTED TOGETHER & SHORTED TO GROUND. FOUND EVIDENCE OF ARCING AT P6027 PIN22, REMOVED PYLON ACCESS PANELS & BEGAN REMOVAL OF HARNESSES IAW AWDP 24-33-01AAA-051A-A . INSTALLED NEW WO8 HARNESS & SECURED FROM PMA TO P6027. INSTALLED NEW UPPER HARNESS OF J6027 BRACKET. INSTALLED UPPER HARNESS AT P5029 & CLAMPED ON TOP OF PYLON. CONTINUED INSTALLING OF UPPER HARNESS THROUGH SEALING PADS IAW AMP 51-23-00 & ESPP 20-10-01. INSTALLED NEW FBWPC & RAN ENG, NO FAULTS MLL M PROCEDURES WERE REVERSED.