As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA INFLIGHT T937/17MAY - DURING CLIMB CREW WAS UNABLE TO RETRACT LANDING GEAR WITH POSITION DETECTOR SYSTEM NUMBER TWO, HAD OTHER SYSTEM FAILURES. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR SENSOR. SYSTEM GROUND CHECKED NORMAL OPERATION.