As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEFECT 777438: DURING PREVIOUS NIGHT DEPLANING GPU POWER DROPPED OFF LINE. EMERGENCY EXITS LIGHTS DID NOT ILLUMINATE WHEN AIRCRAFT WAS UNDER BATTERY POWER AIRCRAFT WAS ON BATTERY ONLY POWER FOR 40 MINUTES DRAINING EMERGENCY BATTERIES - RESOLUTION: CHARGED EMERGENCY BATTRIES REF AMM 33-51-06 OK FOR SERVICE