As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT & RT DUCT PRESSURE SPLIT DURING CRUISE, WITH ENGS RUNNING, LT & RT ISOL VLVS CLSD & BLEED SW ON. LT & RT PSI ARE. DURING TROUBLESHOOTING FOUND EVIDENCE OF HEAT DAMAGE ON CYLINDER SECTION OF HIGH PRESSURE BLEED VALVE. REPLACED VALVE AND RAN ENG, CHECKS OK.