As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDIS 115 33-50 0178 05SEP24 02:24 TPE FACT DURING SERVICE CHECK, FOUND EMERGENCY LIGHT DIDN'T ILLUMANATE. FACT 05SEP24 02:30 TPE FIM: 33-51-00-815-802 AMM: 33-51-07-2-0 REF ABOVE REFERENCE PERFORMED T/S AND FOUND THE BATTERY PACK OF THE POWER SUPPLY WAS MALFUNCTION. REF ABOVE REFERENCE REPLACED BATTERY PACK AND OPERATIONAL TEST NORMAL. A/C OK FOR SERVICE