As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INITIALLY REPLACEING THE FUEL QUANTITY INDICATOR PROBE AFTER FAILING CALIBRATION CHECK. AFTER REMOVAL OF PLUMBING MODULE ASSY (WHICH CONTAINS THE FUEL PUMP, FQI PROBE, AND FLOAT SWITCH), LOOKED INSIDE TANK. FOUND BLADDER HAD COLLAPSED ABOUT MIDWAY FORWARD ON THE TOP OF TANK TO THE TOPSIDE OF THE FORWARD WALL OF TANK.