As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CUSTOMER HAD INTERMITTENT ROUGH ENGINE THAT FINALLY HAD FAILED MAGNETO. DISASSEMBLED & FOUND DISTRIBUTOR GEAR AXEL WAS LOOSE IN BLOCK AND TOWER CONTACTS WERE GROUND OFF. REPLACED DISTRIBUTOR BLOCK AND LARGE GEAR. MAGNETO WAS O/H 250 PRIOR ON 11-1-2004.