What was found
MIA - FLT 5253 - AFTER TAKEOFF FROM MIA, THE NOSE GEAR UNLOCK LIGHT ILLUMINATED AND THE GEAR STARTED TO MAKE A CLUNKING NOISE AS IT TRIED TO RETRACT REPEATEDLY. THE HYDRAULIC SYSTEM ALSO SHOWED A FLUCTUATION. THE AIRCRAFT WAS RETURNED SAFELY TO MIA WITH NO FURTHER INCIDENTS REPORTED. MAINTENANCE REMOVED AND REPLACED THE RIGHT MLG UPLOCK BOX IAW ATR MM. OPERATIONAL AND LEAK CHECK WAS SATISFACTORY AND AIRCRAFT WAS RETURNED TO SERVICE. (M)