As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL DRAINED FROM ONE SIDE TO OTHER CAUSING LOW TANK TO FLOOD. UNABLE TO MOVE FUEL SELECTORS TO OFF POSITION. REMOVED SELECTOR AND FOUND BOTH LEFT AND RIGHT SELECTOR O-RINGS IN A MELTED STATE, PARTS OF O-RINGS IN SELECT OR RACK GEAR. ONE SET OF O-RINGS HAVE DISINTEGRATED. APPEARS THE LACK OF USE AND TIME WERE A CONTRIBUTING FACTOR. (REFERENCE AD 80-18-10 AND PIPER SB 648A. (THESE ARE ON A PA31). THE VALVE IS SIMILAR AND THE PROBLEM THE SAME).