What was found
GEN 1 AMBER DRIVE LIGHT BURNED OUT, ACCOMPLISHED FIM 24-11 TASK 803, STEP C: FAULT ISOLATION UP TO STEP 2(D). RELAMPED, RE-RACKED GCU1, SWAPPED GCU FOR TROUBLESHOOTING PURPOSE, GENERATOR / STBY POWER MODULE, ALL NO HELP. REINSTALLED GCU TO ORIGINAL POSITIONS. VISUALLY CHECK IDG FOR PROPER OIL LEVEL & ELECT CONNECTORS. RAM ENG NR 1 TO VERIFY, NR 1 ENG HAS PROPER VOLTAGE AND FREQUENCY BOTH SHOWED GOOD ON OVERHEAD ELECT PANEL, NR 1 ENG GEN WAS SELECTED ON & NR 1 ENG GEN HELD POWER.SELECTED ON & OFF WHILE RUNNING, CAME ON AND OFF WITH SWITCH SELECTION. FOUND LOOSE WIRE ON TB502 PIN A9 RIEINSERTED LOOSE PIN. ALL P5 -4 PANEL AC SYS PANEL P5-5 GENERATOR DRIVE PANEL LIGHTS CHECKED GOOD.