As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACED LEFT VACCUUM PUMP. ON OPS CHECK, BOTH RED INDICATORS WERE SUCKED IN(RT ENGINE NOT RUNNING) ADVANCE THROTTLE AND RIGHT SIDE POPPED OUT. TESTED MAN VALVE, VALVED FAILED. CORRECTIVE ACTION: REPLACE VALVE.NOTE: MFG REC 10YR REPLACEMENT BUT DOES NOT HAVE ANY./ONE FOUND