What was found
ALL INTERIOR AND EXTERIOR LIGHTS ASSOCIATED WITH BATTERY PACK #3 FAIL TO ILLUMINATE WITH PREFLIGHT TEST AND ASSOCIATED QRH CHARGING PROCEDURE WITH 60 MINUTES OF TOTAL CHARGING. TROUBLESHOT THE #3 BATTERY PACK G-SWITCH TO HAVE BEEN TRIPPED WHEN RESET THE PACK ALLOWED THE LIGHTING TO STAY ILLUMINATED ONLY WITH AIRCRAFT BATTERY POWER APPLIED. PERFORMED BATTERY EXERCISE PROCEDURE #3 BATTERY WOULD NOT HOLD A CHARGE REMOVED #3 EMERGENCY BATTERY PACK P/N 2503 S/N 42182 INSTALLED CUSTOMER SUPPLIED NEW BATTERY PACK P/N 2503 S/N 49688 PERFORMED BATTERY EXERCISE PROCEDURE NO DEFECTS NOTED OPERATIONS CHECKS SATISFACTORY WORK PERFORMED IN REFERENCE TO AMM 33-50-06, AND RADIANT POWER CORP SIL -CBS2S-1-2024-001 REV A.