As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/SYR - FLT 6338 - DURING CLIMB AT 0830 HOURS ON 3-15-97, MADE AN UNSCHEDULED LANDING AT IAD DUE TO PASSENGER DOOR CAPTION WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSP AND REMOVED AND REPLACED PASSENGER DOOR MICROSWITCH, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)