As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT AND RIGHT DUCT SPLIT. REF DF548, TROUBLESHOOT PROBLEMS IN ENGINE PNEUMATIC SYSTEM TO PRV & PRC. REMOVED AND REPLACED NR 2 ENGINE PRV & PRC PER MM. REF PNEUMATIC HEALTH CHECK, FOUND HPSOV SQUEAKING AND WORN. REMOVED AND REPLACED HPSOV.