As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE IN THE COCKPIT ON DESCENT. WHILE ON APPROACH THE SMOKE DISSAPATED. ACFT LANDED SAFELY. MX PERFORMED ENGINE RUNS BUT COULD NOT DUPLICATE THE DISCREPANCY. UPON FURTHER INSP, METALLIC PARTICLES WERE FOUND IN THE COALESCER SOCK AND THE ECU WAS FOUND SEIZED. THE PAC WAS REPLACED.