What was found
EMER LIGHT NOT ARM CAS ON WITH SWITCH IN ARM, ENGINES RUNNING AND NO GPU. GROUND RESET PROCEDURE UNSUCCESFUL. REVIEWED SL505-33-0005 REV 5 "EMER LIGHT T/S" AND FOUND THAT BOTH BATTERY PACKS ARE CAUSING THE ISSUE CONFIRMED 'G' SWITCH NOT TRIPPED. REMOVED FWD EMER LIGHT BATT PACK AND INSTALLED A REPAIRED UNIT . REMOVED AFT EMER LIGHT BATT PACK AND INSTALLED A REPAIRED UNIT. COMPLETED OPS AND CHARGING CHECKS AS REQUIRED WITH NO FAULTS. WORK DONE IAW AMM 33-52-01.