As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3450 THE CREW NOTICED THE EMERGENCY EXIT SIGN APPEARS TO HAVE BURNED OUT LIGHT BULBS. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED LEFT OVERWING EXIT SIGN IAW CRJ AMM 33-51-05. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.