As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 PYLON AIR VALVE INDICATES 10-PSI IN CRUISE WITH 95 PERCENT N1 SET IS NOT REGULATING CORRECTLY WITH ISOLATION VALVE OPEN. THE LEFT AND RIGHT MANIFOLD PRESSURE ONLY INDICATE 26-PSI. LEAK CHECK FOUND NO FAULT ON ENGINE AREA. SUSPECT CRACKED DUCT ON THE WING CAUSED PRESSURE LOW. AFTER REMOVED AND REPLACED DUCT ENGINE RAN CHECK NORMAL AS PER MM 36-11-01 AND 71-00-00.