As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 797 - AFTER TAKEOFF DFW WHEN LANDING GEAR LEVER RAISED, LANDING GEAR WOULD NOT RETRACT WITH HYDRAULIC PRESSURE INDICATING NORMAL. AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT INCIDENT. LUBRICATED LANDING GEAR AND ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)