What was found
DURING CLIMB UPON FLAP RETRACTION, LOST YELLOW SYSTEM HYDRAULIC FLUID. FLIGHT RETURNED TO MIA WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE YELLOW PTU PLUG BLOWN OUT AND THE NBR 2 ENGINE DRIVEN HYDRAULIC PUMP INOPERATIVE. REPLACED THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP, 2-WAY HYDRAULIC VALVE, PTU MANIFOLD, AND PRIORITY VALVE. LEAK AND OPERATIONAL CHECK NORMAL.