What was found
PRESSURIZATION DUCT, PRESSURE IS 18 PSI, N1 97 IN CLIMB. IN CRUISE N1 87.5 LT DUCT PRESSURE 20 PSI. RT DUCT PRESSURE 36 PSI. DURING DESCENT THROUGH 30,000 FT, N1 37 BOTH LT & RT DUCT PRESS 19 PSI. ACCOMPLISHED T/C NG-36WC-00001 FOR NR1 ENG BLEED AIR SYS HEALTH CHECK. R & R NR 1 ENG HIGH STAGE VALVE, OPS/ LEAK CHECK NORMAL. REF AMM 36-11-06 AND R & R 1 ENG PRECOOLER CONTROL VALVE, OPS/LEAK CHECK NORMAL REF AMM 36-12-02 15641. PERFORMED OPS CHECK IAW MM 36-11-00-710-801 OF ENGINE BLEED AIR CROSSOVER OPS TEST.