As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LANDING GEAR WOULD NOT RETRACT. INDICATION WAS THREE RED DOOR LIGHTS THREE GREEN DOWN AND LOCKED LIGHTS ON. HANDLE WOULD NOT GO ABOVE NEUTRAL POSITION. TRIED BOTH SYST NR 1 AND SYST NR 2 AS PER QRH AND C/BS. PERFORMED VISUAL INSPECTION TO PITCH DAMPER, NO LEAK DETECTED. RECTIFIED HYDRAULIC LEVEL IAW AMM 12-12-32. PERFORMED MLG TEST IAW AMM 32-31-00.