As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE GEAR LEVER WOULD NOT RAISE BEYOND THE OFF POSITION AFTER TAKEOFF. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE WAS UNABLE TO DUPLICATE THE FAILURE. THE R276 AIR SENSING RELAY WAS REPLACED AS A PRECAUTIONARY MEASURE. AN EXTENSION AND RETRACTION CHECK WAS PERFORMED AND ALL OPERATION AND INDICATIONS WERE NORMAL.