As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER PACK, M1669, FAILS EMERGENCY LIGHTING FUNCTIONAL CHECK, BATTERY DISCHARGES IN LESS THAN 8 MINS. (REF. AAR NR 99962695). REMOVED AND INSTALLED NEW BATTERY PACK M1669 IAW B737 AMM 33-51-06-960-805, TEST OK (WORK ACCOMPLISHED BY V936248 & AAR QCA-74 V918045).