As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED & ACFT WAS GNDED. FUMES IN COCKPIT AT 370, ALSO DETECTED IN THE CABIN. FLIGHT CREW DECLARED AN EMER & DIVERTED WHERE THE ACFT LANDED WITHOUT FURTHER INCIDENT. REPLACED THE AVIONICS EXTRACT FAN & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 21-46-43.