As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O RT DUCT PRESS 15PSI LT DUCT 45PSI FLIGHT CREW REPORTS DUCT PRESSURES NOW EVENLY MATCHED AT 45 PSI AT CRZ ALT. FOUND RT ENGINE PRECOOLER VALVE TO FAIL PNEUMATIC HEALTH TEST. REPLACED PRECOOLER CONTROL VALVE, REF AMM 36-12-02-400-801. ADD EMP:094388 ROTABLE PARTS CHANGE WAS INDICATED -TT NR 1177634 SN OFF 8027 VALVE, PRECOOLER OFF 29-3612-9-0008 8027 ON 29-3612-9-0008 3144.