As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED, ON REACHING AN ALTITUDE OF 20,000 FT THE FORWARD ENTRY DOOR WARNING ANNUNCIATOR ILLUMINATED. THE CREW BURNED OFF EXECESS FUEL AND RETURNED TO BASE. MX PERSONNEL FOUND THE UPPER DOOR AJAR WARNING SWITCH BRACKET WAS BENT. THE BRACKET WAS STRAIGHTENED AND THE SWITCH WAS READJUSTED. THE DOOR WARNING SYSTEM OPERATIONALLY CHECKED GOOD AND THE AIRPLANE WAS RELEASED FOR SERVICE.