As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST PRIOR TO DESCENT, HEAVY SMELL OF ELECTICAL WIRE HEATING. FOUND 6H21 EXHAUST FAN C/B OUT. SELECTED OVERIDE ON EQUIPMENT COOLING, AND SMELL WENT AWAY. FWD TO MCO AND PLACARD MEL 21-58-04B C/B COLLARD. REPLACED FWD EQUIPMENT COOLING FAN, OPERATION NORMAL.