As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/SYR - FLT 6387 - DURING CRUISE AT 2230 HOURS ON 4-13-98, AIRCRAFT MADE AN UNSCHEDULED LANDING AT IAD DUE TO PASSENGER DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEANED AND LUBED MICROSWITCH ACTUATOR, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)