As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3921 THE CREW REPORTED THE MAIN CABIN DOOR WAS DIFFICULT TO SECURE CLOSED. IT INDICATED CLOSED BUT THE EXTERIOR HANDLE HAS TO BE FORCED TO THE FLUSH POSITION. THE AIRCRAFT WAS REMOVED FROM SERVICE. SERVICED THE MAIN CABIN DOOR FRAME ROLLERS IAW EMB145 AMM 53-21-02. NO PARTS WERE REMOVED OR REPLACED. THE AIRCRAFT WAS RETURNED TO SERVICE.