As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING LANDING GEAR FUNCTION TEST, GEAR HANDLE SOLONOID STAYED LATCHED WHEN AIRCRAFT WAS ON JACKS NOT ALLOWING GEAR TO RETRACT. AFTER TROUBLESHOOTING IT WAS FOUND THAT BOTH LEFT AND RIGHT PROXIMITY SENSORS HAD FAILED IN THE GEAR DOWN WOW POSITION.