As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER WATER LANDING PILOT EXPERIENCED LOSS OF WATER RUDDER STEERING CONTROL. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE TORQUE TUBE WHICH CONTROLS THE WATER RUDDER/TAIL WHEEL STEERING HAD SUFFERED A TORSIONAL SHEAR ACROSS THE TUBES DIAMETER AT ITS MIDWAY POINT. THE FAILURE WAS A DIRECT RESULT OF INTERNAL CORROSION ON THE TUBE.