As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT, THE FLIGHT CREW TOOK OFF, RETRACTED LANDING GEAR AND NOTICED GEAR HANDLE STAYED RED INDICATING. LANDING GEAR WAS NOT FULLY UP AND STOWED. FLIGHT CREW LOWERED LANDING GEAR AND LANDED WITHOUT INCIDENT. ONLY FLIGHT CREW WAS ON BOARD. THERE WAS NO SPECIFIC PART CAUSING PROBLEM. INSPECTING LANDING GEAR AND ADJUST UPLIMIT SWITCH IAW MM.