As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS ALL FAIL TEST. SUSPECT LIGHTS WERE LEFT ON BY CLEANERS ON REMOTE PARKING WITH NO GPU. FOUND FWD RH (M1674) AND MID LH (M1668) BATTERIES UNABLE TO CHARGE AND PASS RUN TEST. R & R BATTERY PACKS M1674 AND 1668 PER AMM 33-51-00.