What was found
FOR FLIGHT 3764 WHILE ON THE GROUND DURING BOARDING AN ELECTRICAL BURNING ODOR WAS NOTICED IN THE CABIN. THE CREW EVACUATED THE PASSENGERS. SUSPECT OF ISSUE WAS BAD BALLAST. THE FORWARD SIDEWALL LIGHTS WENT OUT. THE AIRCRAFT WAS REMOVED FROM SERVICE. UPON TROUBLESHOOTING FOUND THE FORWARD LEFT SIDEWALL LIGHT BALLAST BURNED. REMOVED AND REPLACED THE BALLAST IAW CRJ MM 33-21-03. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.