As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND M5168 EMERGENCY POWER COULD NOT STAY MORE THAN 15 MINS IAW AMM 33-51-04-900-803, REV 47. REPLACED POWER SUPPLY BATTERY (M5168) AT UPPER DECK, THE CONDITION CHECK NORMAL IAW AMM 33-51-04-900-803 REV 47. PERFORMED INSTALLATION TEST OF (M5168) POWER SUPPLY - BATTERY. THE RESULT WAS SATISFACTORY.