What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED AIR/GROUND PROXIMITY BOX. SYSTEM GROUND CHECKED NORMAL OPERATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. RETURNED TO MIA AND LANDED WITHOUT INCIDENT. REPLACED AIR/GROUND PROXIMITY BOX. SYSTEM GROUND CHECKED NORMAL OPERATION.