As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THE MAIN CABIN DOOR WAS REALLY HARD TO OPEN. THE HANDLE WAS GETTING STUCK TRYING TO OPEN IT FROM THE INSIDE. THE ACFT WAS REMOVED FROM SERVICE. CLEANED AND LUBRICATED CABIN DOOR SIDE ROLLERS IAW AMM 52-18-00. TESTED SATISFACTORY. THE ACFT WAS RETURNED TO SERVICE.