What was found
AFTER TAKEOFF, CLIMBING THRU 1,000 FT AGL, BLEED SPLIT OBSERVED OVER 20 PSI 1,000 FT AGL = RT BLEED=18 PSI/LEFT BLEED=40 PSI N1= 87.5 PERCENT 18,000 FT=RIGHT BLEED=20 PSI /LT BLEED=40 PSI N1 = 86.0 PERCENT CRUISE FL 370, RIGHT BLEED, 22 PSI / LT BLEED=38PSI N1= 87.9 PERCENT DESCENT FL 90 = RT BLEED, 20 PSI /LEFT BLEED - 22PSI N1 = 55.0 PERCENT. ACFT GROUNDED. ACCOMPLISHED TC NG-36WC-00001, BLEED AIR SYS HEALTH CHECK USING PNEUMATIC KIT ASA PN 0-1300-0-1765. HEALTH CHECK ON NR 2 ENGINE FAILS STEP 2.K.11 BLEED AIR REGULATOR AND STEP 3.F.5, PRE COOLER CONTROL VALVE. REPLACED NR 2 BLEED AIR REGULATOR IAW AMM 36-11-03. REPLACED NR 2 ENGINE PRECOOLER CONTROL VALVE IAW AMM 36-12-02. PERFORMED ENGINE BLEED CROSSOVER CHECK AND 5 MINUTE HIGH POWER RUN IAW AMM 36-11-00-710-801. OPS CHECK NORMAL.