What was found
DUCT PRESSURE SPLIT NOTED DURING EARLY CRUISE. LEFT 17PSI RT 40PSI. NOW BOTH READ 40PSI. DESCENT 20PSI BOTH LT AND RT. ACFT GROUNDED. ACCOMPLISHED BLEED SYS CHECK FOUND KISS SEAL ON PRECOOLER DAMAGED. AS PRECAUTION, REPLACED PRECOOLER VALVE AND SEAL. CHECKED ALL LINES NO LEAKS NOTED. FOUND AIR LEAKS FROM PRSOV. REPLACED VALVE NO FURTHER DISCREPANCIES NOTED. REF MM 36-11-00, 36-12-02, 36-11-04. ACCOMPLISHED 2 MIN HIGH POWER RUN, NO DEFECTS NOTED. NO HISTORY LAST 90DAYS.