As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT FROM MKE ENGINE NUMBER 2 HAD FIRE INDICATIONS, COMPLIED WITH COM, AND RETURNED TO MKE. THE FIRE DETECTION LOOP ON THE BOTTOM OF THE ENGINE WAS FOUND TO BE CHAFING. REPOSITIONED LOOP AND CLAMP. CORRECTED SEVERAL SMALL AIR LEAKS.