As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - NOSE GEAR WOULD NOT RETRACT AFTER TAKEOFF, HAD RED NOSE GEAR LIGHT ON WITH HANDLE UP. GEAR EXTENDED OK. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. AIRCRAFT TAKEN OUT OF SERVICE. FOUND NOSE STRUT NEEDED SERVICE. SERVICED NOSE STRUT. SYSTEM GROUND CHECKED NORMAL OPERATION.