As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6565 - IAD-GSO - DURING CLIMB-OUT, RETURNED TO IAD DUE TO THE MAIN DOOR WARNING LIGHT ILLUMINATING IN FLIGHT. AIRCRAFT RETURNED TO IAD WITH NO FURTHER INCIDENTS. MAINTEANCE CLEANED THE DOOR WARNING MICROSWITCHES. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)