As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, CREW REPORTED THAT THE EMERGENCY LIGHTS FROM ROW FIVE AND AFT ILLUMINATED FOR APPROXIMATELY ONE TO TWO SECONDS AND THEN WENT DIM DURING TEST. MAINTENANCE REMOVED AND REPLACED THE POWER SUPPLY. AIRCRAFT WAS RETURNED TO SERVICE (M)