As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, GEAR FAILED TO RETRACT. (3) GEAR LIGHTS EXTINGUISHED BUT RED UNLOCK LIGHT ILLUMINATED. CREW FOLLOWED CHECKLIST AND LOWERED GEAR. FOUND LOWER BARREL ASSEMBLY ON NOSE GEAR WITH 0 PSI AND LEAKING HYDRAULIC FLUID. REMOVED AND REPLACED UPPER AND LOWER BARREL ASSEMBLY PERFORMED GEAR SWINGS AND NOSE WHEEL STEERING FUNCTIONAL CHECK. OPS CHECK AND LEAK CHECK GOOD IAW CE750 MM CH 32-20-00