As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3253 THE CREW REPORTED THE MAIN CABIN DOOR IS STICKY AND HARD TO OPEN. THE AIRCRAFT WAS REMOVED FROM SERVICE. CLEANED AND LUBED IAW AMM 52-18-00. THE OPERATIONAL CHECK WAS GOOD. NO DEFECT NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.