As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVING PROPELLER TO CHECK FOR AN OIL LEAK, PIN, PITCH CHANGE, AND BLOCK FELL TO GROUND (LINKSCREW). FOUND PIN SHEARED IN HALF FOR REASONS UNKNOWN. PIN WAS .4375 INCH DIAMETER. MFG CLAIMS PIN SIZE INCREASED TO .50 INCH DIAMETER IN 1957 DUE TO HISTORY OF .4375 INCH PINS FAILING.