As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FUEL QTY SENDER IN THE TIP TANK (FLINT) CORRODED SEVERELY DUE TO THE TANK BEING LEFT EMPTY MOST OF THE TIME. CONDENSATION AND RUST TOTALLY DESTROYED THE SENDER. RECOMMEND KEEPING SOME FUEL IN THE TIP TANKS AT ALL TIMES. STC SA1335SO.