As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED ISOLATION VALVE NOT IN COMMANDED POSITION. STATUS MESSAGE 01- ACTIVE CRUISE MODE DEPENDENT; ISOLATION VALVE (LT) FAILED CLOSED. DB- AIR SUPPLY & CABIN PRESSURE CONTROLLER (R) MSG-3610280 ACTIVE ER MODE. REPLACED LT ISOLATION VALVE IAW MM.