What was found
FLT KMIA-SJO - REJECTED TAKEOFF DUE TO AIRSPEED DIFFERENCE, CAPTAIN 80 KNOTS, F/O 120 KNOTS, ABORTED AT 120 KNOTS. FOUND CAPTAIN PITOT SYSTEM LEAKING AT ELBOW FROM FLEX LINE TO HARD LINE AT PITOT TUBE. DISCONNECTED AND RESECURED ELBOW. PERFORMED OPERATION/LEAK CHECK IAW B757 MM 34-11-00, SYSTEM OPERATED SATISFACTORY. RETURNED AIRCRAFT TO SERVICE. (M)