As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, GEAR WOULD NOT RETRACT (HANDLE WOULD NOT GO PAST OFF) AFTER TAKEOFF. QRH SAY THIS INDICATES A FAILURE OF AIR/GRD SAFETY SENSOR OR FAILURE OF THE GRD. SPOILER INTERLOCK VALVE TO CLOSE. REINSTALLED GROUND SPOILER INTERLOCK VALVE CABLE IAW AMM.