As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/PHL - FLT 6237 - DURING CLIMB AT 1225 HOURS ON 6-25-97, MADE AN UNSCHEDULED LANDING AT IAD DUE TO PASSENGER DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED DOOR BEARINGS AND LEVER, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. REF: OPERATOR CONTROL NR 97ZZZX3618. (X)