As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF THE FOLLOWING MESSAGES WERE DISPLAYED IN THE COCKPIT: STEERING INOP, GEAR DISAGREE, W.O.W. SENSOR FAILURE AND W.O.W. STATUS. NOSE GEAR REMAINED IN DOWN POSITION WITH MAIN GEAR RETRACTED. AIRCRAFT TURNED-BACK AND LANDED UNEVENTFULLY. MAINTENANCE REPLACED THE MLG PRIORITY VALVE AND THE ELECTRIC MOTOR DRIVEN PUMP HYDRAULIC SYSTEM 3B (P/N 848847), FOLLOWED BY SUCCESSFUL GEAR SWINGS.