What was found
MIA - FLT 901 - AFTER TAKEOFF MIA WHEN LANDING GEAR RETRACTED, NLG UNSFE LIGHT REMAINED ILLUMINATED. RECYCLED LANDING GEAR AND NOSE LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED UNITL AIRCRAFT ENTERED A STANDARD RATE TURN AND THEN LIGHT EXTINGUISHED. AIRCRAFT RETURNED TO MIA FOR ANOTHER REASON AND LANDED WITHOUT INCIDENT. CHECKED NOSE LANDING GEAR WITH NO DEFECTS FOUND. AIRCRAFT MAINTENACNE FERRY MIA/DFW. REPLACED LANDING GEAR PROXIMITY SWITCH ELECTRONIC UNIT. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)