What was found
COURIER COMPARTMENT EMERGENCY LIGHT TEST INOP. R & R 29WL1 POWER SUPPLY BATTERY IAW MM 33-55-00-05, NO HELP, REINSTALLED ORIGINAL BATTERY, SUSPECT POWER SUPPLY UNIT 29WL1 BAD. R & R PWR SUPPLY MM 33-55-00-05. NO HELP, SUSPECT BATTERY. PREMATURE REMOVAL/INSTALLATION. BATTERY AND POWER SUPPLY PREVIOUSLY CHANGED. PERFORMED BITE TEST ON POWER SUPPLY AND NO FAULTS NOTED. PERFORMED EMERGENCY LIGHTS TEST IAW AMM 33-51-00-05-0. OPS CHECKS NORMAL. REPLACED 29WL1 POWER SUPPLY BATTERY.