What was found
ORD - FLT 904 - AFTER TAKEOFF AND ON GEAR RETRACTION, CREW COULD NOT RETRACT THE NOSE GEAR. THIS IS THE SECOND RETURN TO FIELD OF THIS FLIGHT ON THIS DAY. MAINTENANCE SERVICED THE NOSE STRUT WHILE ON JACKS, AND THEN SWUNG THE GEAR. AIRCRAFT RELEASED FOR SERVICE. (M)