As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MULTIPLE PIECES OF A BURNED AND BROKEN BOLT FOUND IN ENGINE COWLS. BOLT DETERMINED TO BE FROM REAR OF STARTER HOUSING. UPON FURTHER INSPECTION, TWO OF THE REMAINING THREE CASE THROUGH-BOLTS WERE FOUND LOOSE. MISSING BOLT SHOWED SIGNS OF ELECTRICAL ARCING LEADING TO EVENTUAL CUTTING OF THE BOLT. (X)