As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UNABLE TO SHUT OFF FUEL FOR EITHER TANK, O-RINGS FOUND IN PIECES IN EACH CORRESPONDING GASCOLATOR AFTER TANKS WERE DRAINED. PREVIOUS AMO HAD SERVICED CABLES DUE TO STIFF VALVE ACTUATION. CABLES WERE FOUND SERVICEABLE AND SUSPECT STIFFNESS DUE TO DEGRADED O-RINGS. O-RINGS REPLACED PER SB USING O-RING KIT 760-504.