As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH FUEL SELECTOR VALVE IN OFF POSITION FUEL LEAKS BY VALVE, SLIGHT PRESSURE ON CABLE DRUM ON VALVE MAKES IT WORSE. (SIDE LOAD) THIS VALVE MUST BE CHECKED DURING AN ANNUAL IN THE OFF POSITION AND PUTTING PRESSURE ON DRUM TO SEE IF FUEL FLOWS THROUGH VALVE IN THE OFF POSITION. (K)