What was found
BLEED TRIP OFF LIGHT COMES ON DURING TAKEOFF LIGHT NO. 1 BLEED TRIP OFF DURING T/O. HAPPENED TWICE AT HIGH N1 ABOVE 90 PERCENT. CREW REPORTS BOTH ENGINE BLEEDS WERE CLOSED FOR HOT TAKEOFF -APU BLEED WAS ON ONLY. #1 ENGINE BLEED PRSOV LOCKED CLOSED IN REFERENCE TO MEL 3605A. FOUND PRSOV REF PRESSURE FLEX LINE FROM VALVE TO REGULATOR LEAKING, REF AMM 36-11-00-700-803. ACP HIGH POWER RUN ON ENGINES, BLEED PRESSURES WITHIN LIMITS AND NO BLEED TRIPS.