As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAT - DURING SCHEDULED MAINTENANCE, CABIN EMERGENCY LIGHTING SYSTEM FAILED OPERATIONAL CHECK. FORWARD CABIN LIGHTS FAILED TO ILLUMINATE. MAINTENANCE REPLACED BATTERIES IN EMERGENCY LIGHT POWER SUPPLY. SYSTEM OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)