As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT ON ARRIVAL, THEY COULD SEE AND SMELL SMOKE IN THE COCKPIT, WITH A LOUD NOISE FROM THE BELLY. LANDED WITHOUT INCIDENT. INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE NR 1 ACM, OPS TESTED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.