What was found
ON CLIMBOUT, STARTING AT 15,000FT, DUCT PSI WAS 15 PSI SPLIT. AT CRUISE, LT DUCT PSI 22 RT DUCT PSI 43, N1-91 AND 90.8, N2 - 93.8 AND 93.7. TAT -21C, -48 SAT. ACFT GROUNDED. ACCOMPLISHED NR 1 ENGINE BLEED AIR SYS HEALTH CHECK T/C NG-36WC-00001, NO DEFECTS NOTED. PERFORMED LEAK CHECK OF BLEED AIR COMPONENTS IN CONJUNCTION T/C, NO DEFECTS NOTED. REPLACED PRECOOLER VALVE SENSOR IAW MM 36-12-03 AND BLEED AIR OVERTEMP SENSOR IAW MM 36-11-05, LEAK CK GOOD. PERFORMED EXTENDED PERIOD HIGH POWER ENGINE RUN. PNEUMATIC SYS FUNCTIONED NORMALLY REF FIM TASK 36-10-00-810-804.