What was found
CHIME QAR ALERTING RIGHT *DUCT PRESSURE < 29*. RT SIDE HAS BEEN RUNNING 10+ PSI LOWER THAN LT SIDE DURING HIGH N1 (5TH STAGE) OPS FOR A FEW LEGS NOW. PERFORMED ENG BLEED AIR SYS HEALTH CHK ON ENG NR 2 IAW AMM TASK 36-11-00-700-801, & FOUND PC LESS THAN 20 PSIG FROM BAR. PERFORMED REMOVAL & INSTALLATION OF BLEED AIR REGULATOR IAW AMM TASK 36-11-03. OPS TEST REQUIRED. PERFORMED ENG BLEED AIR SYS HEALTH CHK ON ENG NR 1 IAW AMM TASK 36-11-00-700-801. NO FAULTS FOUND. PERFORMED ENG BLEED AIR CROSSOVER OPS TEST ON BOTH ENGS IAW AMM 36-11-00-710-801. BOTH ENG IN PARAMETERS OF OPS TEST.