As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OUTFLOW VALVE AFT AUTO CONTROL ON AFT OUTFLOW VALVE FAILED. REPLACED AFT OUTFLOW VALVE ACTUATOR ASSY IAW MM 21-31-03 TASK 21-31-03-400-818-001. OPS CHECKED GOOD. FAULT REOCCURED. MESSAGE 21-39490, RANG OUT WIRING FROM R ASCPC TO AFT OUTFLOW VALVE CONNECTOR DM21312D, WIRING CHECKED GOOD TO VALVE, NO SHORTS OR OPENS. REPLACED ASCPC IAW MM, SYS CHECKED GOOD.