As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND UPPER LIGHT BATTERY PACKS CAPACITY LOW (M5057) IAW AMM 33-51-04-902-001-001, REV 98. REPLACED THE BATTERY IAW AMM 33-51-04-902-001-001, REV 98. PERFORMED AN EMERGENCY LIGHT BATTERY. POWER SUPPLY TEST AND THE RESULT WAS SATISFACTORY.