What was found
LEFT BLEED TRIP OFF LIGHT ILLUMINATED REPEAT WRITE UP. NR 1 ENG HIGH STAGE REGULATOR (HSR) FAIL HEALTH CHECK TEST REGULATOR, REMOVED N REPLACED HI STAGE REGULATOR REF AMM 36-11-07 OPS CHECKS GOOD. PERFORMED HEALTH CHECK FOR 1 ENG, FOUND BLEED AIR REGULATOR (BAR) HAVE A BLEED AIR LEAK REGULATOR, REMOVED AND REPLACED BLEED AIR REGULATOR REF AMM 36-11-03/401. ENGINE IDLE LEAK CHECK. OPS CHECK GOOD. PERFORMED HEALTH CHECK FOR 1 ENG P, FOUND PRECOOLER VALVE HAVE A BLEED AIR LEAK. REMOVED AND REPLACED #1 ENG PRECOOLER CONTROL VALVE REFERENCE: TASK 36-12-02-400-801 . PARA A TO F, UP TO TEST INSTALLATION . PERFORMED OPS CHECK GOOD.