As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3445 THE CREW REPORTED THE CABIN MAIN DOOR SENSOR KEPT GIVING A MAIN DOOR OPEN WARNING ON THE GROUND. THE FLIGHT ATTENDANT HAD TO OPEN AND CLOSE THE DOOR TO RESET IT. THE AIRCRAFT WAS REMOVED FROM SERVICE. RE-ADJUSTED SWITCH ON THE MAIN CABIN DOOR IAW EMB 52-73-01. NO PARTS REMOVED OR REPLACED. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.