As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY BATTERY PACK M1694 DOES NOT CHARGE. (REF: AAR NR 1000034040) REMOVED AND INSTALLED NEW POWER SUPPLY BATTERY PACK M1694 IAW B737 AMM 33-51-06-960-805 OP TEST GOOD (WORK ACCOMPLISHED BY V937546 AND AAR QC A-11 V931821) SDR IS COMPLIED WITH. SDR #1555