As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT ENG BLEED ISOLATION VALVE MESSAGE, FLIGHT DIVERTED. ACCOMPLISHED CHECK OF CMC FOR FAULT MSGS REGARDING LT ISOLATION VALVE. FAULT SHOWED ISOLATION VALVE FAILED IN CLOSED POSITION. ACP TEST OF LT & RT AIR SUPPLY SYS THROUGH CMC. TESTS PASSED. LOCKED LT ISOLATION VALVE IN OPEN POSITION. REPLACED LT BLEED ISOLATION VALVE PER MM. LEAK AND OPS TEST GOOD.