As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED TO DTW DUE TO NUMBER 2 ENGINE FIRE WARNING SOUNDING IN FLIGHT AND FIRE BOTTLES ACTIVATED. CREW PERFORMED ENGINE SHUTDOWN PROCEDURES. AIRCRAFT LANDED AT DTW WITHOUT INCIDENT. INSPECTED AND FOUND NO EVIDENCE OF FIRE OR OVERHEAT CONDITION. REPLACED FIRE DETECT MODULE, FIRE CONTROL PANEL, FIRE BOTTLES AND OP CHECKED SYSTEM PER BOEING M/M.