As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE CREW OF FLIGHT 2302 NOTICED A LOUD WHINE FROM THE FIRST OFFICERS SIDE PANEL AREA. THE AIRCRAFT RETURNED TO CLT WHERE MAINTENANCE FOUND THE AC ELECTRICAL-GROUND POWER ACCESS DOOR OPEN. THE DOOR WAS INSPECTED IAW CRJ 200 AMM 52-45-00-210-801 AND FOUND TO BE IN SERVICABLE CONDITION. THE DOOR WAS SECURED AND THE AIRCRAFT WAS RETURNED TO SERVICE.