As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, BURNING SMELL IN COCKPIT ACCOMPANIED BY AN UNUSUAL FAN SOUND. ON TAXI, IN LEVEL 2 AVIONICS EXHAUST FLOW OFF ILLUMINATED. AVIONICS COMPARTMENT EXHAUST FAN INOP. ITEM DEFERRED AS PER MEL 21-26 -2. DMP 21-26-2 PERFORMED. GROUND TIME NOT TO EXCEED 2.5 HOURS UNLESS AVIONICS LOAD IS REDUCED. SEE MEL 21-26-2.