As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4640 THE CREW REPORTED THE MAIN CABIN DOOR WAS DIFFICULT TO OPEN. THE AIRCRAFT WAS REMOVED FROM SERVICE. INSPECTED LATCH MECHANISM AND LUBRICATED IT IAW CRJ AMM 52-11-02 AND STANDARD MAINTENANCE PRACTICE. NO PARTS REMOVED OR REPLACED. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.