As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOT EICAS L ENG HPSOV WITH LEFT BLEED LIGHT. ON DESCENT, GOT EICAS L ENG HPSOV WITH LEFT BLEED LIGHT <1 MIN LATER WENT OUT. DURING PNEUMATIC HEALTH CHECK FOUND LEFT AND RIGHT BLEED SYSTEM ISOLATION CHECK VALVES BAD. VALVES WERE REPLACED AND ENGINES RAN, BLEED PRESSURE NORMAL.