As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/RDU - FLT 6590 - DURING CRUISE AT 1851 HOURS ON 12-29-95, RETURNED TO IAD DUE TO THE PASSENGER DOOR WARNING LIGHT ILLUMINATING. AIRCRAFT RETURNED TO IAD WITH NO FURTHER INCIDENTS. MAINTENANCE LUBRICATED MICROSWITCH ASSEMBLY. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)