As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK. RIGHT MAIN LANDING GEAR RED LIGHT ILLUMINATED AFTER GEAR RETRACTION. RIGHT MAIN LANDING GEAR EXTENDED WHEN LANDING GEAR HANDLE MOVED TO OFF, THEN RETRACTED WHEN LANDING GEAR HANDLE MOVED BACK TO UP. OPERATED NORMALLY WITH LANDING GEAR HANDLE DOWN. R&R RT MAIN LANDING GEAR PRIORITY MODULAR VALVE PER AMM.