As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3280 THE CREW REPORTED THE MAIN CABIN DOOR WAS DIFFICULT TO OPEN. THE AIRCRAFT WAS REMOVED FROM SERVICE. FOUND BOTH UPPER AND LOWER AFT DOOR ROLLERS FROZEN. LUBRICATED AND PERFORMED AN OPERATIONAL CHECK AS PER 52-18-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.