As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AIRCRAFT LOAD SHOWED .7 LEFT NORMAL CENTER FUEL PRESSURE WARN ON FOR ABOUT 3 MINUTES THEN WENT OUT. CREW REPORTED ELECTRICAL BURNING SMELL AND THEN SMOKE IN COCKPIT AROUND THE THROTTLE QUADRANT AREA. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. INSPECTED AND COULD NOT DUPLICATE. REPLACED AUTO THROTTLE SERVO M10-16 AS PRECAUTION.