What was found
BLEED DUCT SPLIT 3500, FT L-45, PSI R-20, PSI N1 87.1, 18000 FT L-43 PSI R-20 PSI N1 98.0, FL330 FT L-32, PSI R-24, PSI N1 83.5, FL340 FT L-40 PSI R-22, PSI N1 85.2, TOD L-20 PSI R-20 PSI N1 38, 12000 FT L-45 PSI R-22, PSI N1 81, 18000 FT L-24 PSI R-24 PSI N1 33.1. ACFT GROUNDED. PERFORMED NR 2 ENG BLEED AIR SYS HEALTH CHECK IAW T/C NG-36WC-00001. FOUND BLEED AIR REGULATOR CONTROL PRESSURE BELOW LIMITS AND PRECOOLER CONTROL VALVE DOES NOT REGULATE CONTROL PRESSURE WITHIN LIMITS. REPLACED BLEED AIR REGULATOR ON NR 2 ENG IAW AMM 36-11-03. REPLACED PRECOOLER CONTROL VALVE ON NR 2 ENG IAW AMM 36-12-02. PERFORMED ENGINE BLEED AIR CROSSOVER CHECK. OPS CHECK NORMAL.