As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB, LEFT DUCT PRESSURE 10 PSI, RT 38 PSI IN CRUISE AT FL 360, LT PRESSURE 14 AND RT 41. PRESSURIZATION NORMAL. N1 AND N2 RPMS MATCHED. ACFT GROUNDED. ACCOMPLISHED T/C NG-36WC-00001. FOUND NR 1 PRECOOLER CONTROL VALVE BAD AND NR 1 HIGH STAGE VALVE LEAKING INTERNALLY. R AND R PRECOOLER CONT VALVE REF AMM 36-12-02 AND HIGH STAGE VALVE REF AMM 36-11-06. OPS AND LEAK CHECKS NORMAL NO LEAKS NOTED. SYS GROUND VERIFICATION GOOD.