As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6338 - IAD-SYR - DURING CLIMB, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO PASSENGER DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT LANDED AND RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND COULD NOT DUPLICATE PROBLEM, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)