As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4020, WHILE EN ROUTE FROM EVV TO PIT, DIVERTED TO CVG DUE TO SMOKE IN COCKPIT AND CABIN. MAINTENANCE TROUBLESHOT AND DISCOVERED THE AVIONICS FAN WAS FAILING. MAINTENANCE DEFERRED THE AVIONICS FAN AND GROUND RAN THE AIRCRAFT WHICH CHECKED GOOD. FLIGHT 4020 CONTINUED TO PIT WITH NO FURTHER INCIDENTS.