What was found
CREW PREPARED FOR TAKEOFF, CREW REPORTED NR 1 ENGINE BLEED TRIPPED WHEN TAKEOFF POWER SET. AIRCRAFT RETURNED TO BLOCK WITHOUT INCIDENT. MX TROUBLESHOT & ACCOMPLISHED OPERATIONAL CHECKS OF THE BLEED SYSTEM AND COULD NOT DUPLICATE THE PROBLEM, THE AMERIJET FLIGHT CREW ACCOMPANIED MAINTENANCE AND A HIGH SPEED TAXI WAS ACCOMPLISHED AND WERE ABLE TO DUPLICATE THE PROBLEM. MAINTENANCE REPLACED THE NUMBER 1 ENGINE THERMAL SWITCH & LEFT SIDE HIGH PRESSURE REGULATOR. LEAK CHECK & OPS CHECKOUT GOOD. AMERIJET FLIGHT CREW ACCOMPANIED THE MAINTENANCE MECHANICS ON THE OPERATIONAL CHECKS AND ACCOMPLISHED ANOTHER HIGH SPEED TAXI CHECK, HIGH SPEED TAXI CHECKOUT WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.