As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING EMERGENCY LIGHT TEST, MAINTENANCE FOUND BUSINESS SECTION EMERGENCY LIGHTS INOPERATIVE. REPLACED EMERGENCY LIGHTING BATTERY PACK POWER SUPPLY M33302 PER AMM 33-51-06. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.