As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3987 FOUND MAIN CABIN DOOR HARD TO OPEN AND CLOSE. THE AIRCRAFT WAS REMOVE FROM SERVICE. LUBRICATED MAIN CABIN DOOR GUIDE ROLLERS AND PERFORMED MAIN DOOR INTERNAL ACTUATING HANDLE TEST IAW EMB AMM 52-18-00. OPS CHECK GOOD FOUND TO BE WITHIN LIMITS. THE AIRCRAFT RETURN TO SERVICE.