As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OVERNIGHT LINE CHECK, MAINTENANCE NOTICED FORWARD DOOR EXIT SIGNS AND AISLE EXIT SIGNS NOT ILLUMINATED WITH ASSOCIATED CIDS FAULTS COMM FWD LT AND UNIT AFT LT. MAINTENANCE REPLACED FORWARD EMERGENCY POWER SUPPLY UNIT AND BATTERY, OPERATIONAL CHECK OK.