As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER PACK, M1670, FAILS EMERGENCY LIGHTING FUNCTIONAL CHECK, BATTERY DISCHARGES IN LESS THAN 8 MINS (REF. AAR NR 99970929). REMOVED M1670 BATTERY PACK IAW B737 AMM 33-51-06-960-805; INSTALLED NEW BATTERY PACK M1670 IAW B737 AMM 33-51-06-960-805,INSTALLATION TEST GOOD (SDR #1032413) (WORK ACCOMPLISHED BY V937131 AND AAR QC A-83 V935067).