As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 10L FLOOR LEVEL LIGHTING WAS NOT WORKING. MAINTENANCE FOUND 10L LIGHT CREATED SHORT CIRCUIT DAMAGE TO EMERGENCY POWER SUPPLY UNIT AND REPLACED EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38 AND PERFORMED SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00.