As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN MAINTENANCE BASE HAVING EMERGENCY LIGHT TEST PERFORMED IT WAS NOTICED THAT SECOND AND THIRD CEILING EMERGENCY LIGHTS WERE DIM. MAINTENANCE REMOVED AND REPLACED POWER SUPPLY AND BATTERY AT POSITION NR 3. SYSTEM OPERATIONAL CHECK GOOD AND AIRCRAFT WAS RETURNED TO SERVICE.