As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA INFLIGHT T2125/08APR - NOSE AND MAIN LANDING GEAR WOULD NOT RETRACT AND GEAR HANDLE COULD NOT BE PLACED IN UP POSITION FROM NEUTRAL POSITION. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED THE PROXIMITY SENSOR ELECTRONICS UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.