What was found
EWR/IAD - FLT 6461 - DURING CRUISE AT 2100 HOURS ON 6-28-98, AIRCRAFT MADE AN UNSCHEDULED LANDING AT EWR DUE PASSENGER DOOR WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND OPENED DMI 56397, MEL 52-2. MAINTENANCE CLOSED DMI 56397 ON 6-29-98 BY CLEANING AND LUBING ALL MICROSWITCHES ON PASSENGER DOOR. OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)