As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLEED ISLN VALVE RIGHT BLEED ISOLATION VALVE NOT IN COMMANDED POSITION. MESSAGE WAS LATCHED. TRIED SEVERAL TIMES TO UNLATCH, NO HELP. RESEATED CONNECTOR ON VALVE AND MSG CLEARED. MSG RETURNED AFTER SEVERAL MINUTES. VALVE LOCKED IN OPEN POSITION PER MEL REF 3612G. REPLACED VALVE. ACP ISO VALVE TESTS IAW MM.