As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1571 - EN ROUTE DFW-TUS, SHORTLY AFTER TAKEOFF ATTEMPTED TO RAISE LANDED GEAR. LANDING GEAR WOULD NOT RETRACT. RETURNED DFW AND LANDED WITHOUT FURTHER INCIDENT. SERVICED NOSE LANDING GEAR STRUT. ACCOMPLISHED GEAR RETRACTION PER THE MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)