As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LEFT AUXILIARY FUEL PUMP CORRODED AND BOTH THE LEFT AND RIGHT CHECK VALVES P/N FACKV-4-100-6 FUND CLOGGED. THIS AIRCRAFT HAS FLINT STC SYSTEM STEEL PARTS WHICH ACCORDING TO SUBMITTER ARE CAUSING THE CORROSION AND CAN CLOG FUEL SYSTEM. STC SA4368WE.