As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/AVP - FLT 7738 - DURING CRUISE AT 2,255 HRS ON 5-3-99, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO PASSENGER DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND RECYCLED PASSENGER DOOR THREE TIMES, OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)