As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN DOING EMERGENCY LIGHTS TEST WE FOUND THAT THE EXIT SIGN OVER THE MAIN CABIN DOOR WILL NOT TURN ON. REPEAT WRITE UP. REMOVED EMERGENCY BATTERY AND INSTALLED CUSTOMER SUPPLIED OVERHAULED EMERGENCY BATTERY PERFORMED OPS CHECK OF EMERGENCY BATTERIES WITH NO FAULTS NOTED IAW AMM 33-51-01 & AMM 33-51-00.