As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PHASE INSPECTION, EMERGENCY LIGHT OPERATIONAL CHECK, THE LIGHTS FAILED TO TURN ON. FURTHER INVESTIGATION REVEALED THAT THE EMERGENCY LIGHT POWER SUPPLY WAS DAMAGED. ALL BATTERIES CELLS WERE CORRODED AND THE BATTERY BOX MELTED. THE BATTERY PACK 2 AMP FUSE CHECKED SERVICEABLE. BATTERY PACK WAS REPLACED.