As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 2 INCH VERTICAL CRACK IN UPPER END OF SPAR WEB AT UPPER HINGE FITTING. UPPER FITTING LOOSE ON RIB - HINGE PIN LOOSE IN FITTING. CRACK IN SPAR NOT READILY VISIBLE UNTIL RUDDER IS REMOVED. PROBABLY A RESULT OF HIGHER AIRSPEEDS WITH TURBINE POWERED OTTER.