As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PROPELLER DEICE BRUSH MOUNTING SCREWS WERE PAN HEAD SCREWS WITH NO LOCKING DEVICE. THE PARTS BOOK CALLS FOR PN MS35275243 SCREW. THIS IS FILLISTER HEAD SCREW WITH THE HEAD DRILLED FOR SAFETY WIRE. THE PROPER SCREWS WERE OBTAINED, INSTALLED, AND SAFETIED. THIS IS A LOW TIME AC AND NO RECORD OF BRUSH MAINTENANCE OR REPLACEMENT WAS DOCUMENTED IN THE AC RECORDS.