As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE REPORTED THAT THE EMERGENCY LIGHTS POWER SUPPLY AT THE LEFT MID CABIN HAD ALL THE FAULT LIGHTS ILLUMINATED ON THE PACK. MAINTENANCE REMOVED AND REPLACED THE POWER SUPPLY AND BATTERY PACK IAW AWA TASK CARDS R1C33303 AND A1C33302. OPERATIONAL CHECKS WERE GOOD. COULD NOT CONFIRM FAULT. UNIT WAS TESTED AND INSPECTED IAW CMM 33-51-09 REV 2.