As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, A STRONG BURNING SMELL WAS REPORTED IN CABIN. THERE WAS NO VISIBLE SMOKE PRESENT. FLIGHT WAS RETURNED TO DTW AND LANDED WITHOUT INCIDENT. EMERGENCY EQUIPMENT WAS CALLED OUT AS A PRECAUTION. MAINTENANCE FOUND NR 4 BRAKE DRAGGING AND NR 2 MAIN TIRE FLAT SPOTTED. REPLACED BRAKE AND TIRE. AIRCRAFT RETURNED TO SERVICE.