As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUNCTIONAL TEST EMERGENCY LIGHTS BATTERY PACKS FOR CAPACITY (15 MIN. MINIMUM). FOUND EMERGENCY LT L1533, L5733, L5767 & M4915 WENT OFF IN LESS THAN 15 MINUTES. EMERGENCY LT POWER PACK M5169 REPLACED AND OPERATION CHECKED NORMAL IAW AMM 33-51-04.