As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO REMOVED FROM ENGINE FOR 550 HOUR INSPECTION IAW THE MAINTENANCE MANUAL. DURING INSPECTION FOUND THAT THE CARBON BRUSH WAS RUBBING AND CAUSING CARBON DUST. RECOMMENDATION IS TO HAVE MFG LOOK AT REDUCING THE TOLERANCES BETWEEN THE DISTRIBUTOR BLOCK AND THE GEAR POST WHERE THEY FIT TOGETHER TO HELP PREVENT GEAR FROM ROCKING BACK AND FORTH.