As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK. FLIGHT CREW REPORTED GEAR HANDLE WOULD NOT MOVE TO "UP" POSITION AFTER TAKEOFF AND LANDING GEAR WARNING HORN WOULD NOT SILENCE AFTER FLAPS WERE RETRACTED. REPLACED LANDING GEAR ACCESSORY UNIT AS PRECAUTIONARY PER MM 32-07-100. ADJUSTED GROUND SPOILER INTERLOCK CABLE, PERFORMED OPERATIONAL TEST PER MM 27-62-51 AND CHECKED OKAY. ADJUSTED LANDING GEAR SAFETY SENSORS, PERFORMED OPERATIONAL TEST PER MM 32-04-200 AND CHECKED OKAY.