As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ARRIVED NEW TO THE REPAIR STATION FOR FLOAT INSTALLATION MODIFICATION. UPON REMOVING PROPELLER FOR OUTSIDE PITCH LOCK MODIFICATION, WE FOUND THE SPECIAL CHAMFERED HEAD BOLTS PN B-3339 AND SPECIAL CHAMFERED WASHERS PN A-2048-2 ATTACHING THE PROPELLER TO THE MOUNTING FLANGE WERE IMPROPERLY INSTALLED. THE SPECIAL WASHER WAS NOT PROPERLY ALIGNED WITH THE BOLT HEAD.