As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE LEFT DUCT PRES 26 RT 42 PSI. THEN BOTH AT 26. ACP TROUBLESHOOTING IAW SERVICE TIP. REPLACED HIGH STAGE PILOT ON NR 2 ENG IAW MM. ACCOMPLISHED PNEUMATIC HEALTH CHECK OF HPSOV AND HIGH PRESSURE CONTROLLER IAW MM. SYS OPS CHECKED GOOD.