As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 307 - MYR - SMOKE AND FUMES NOTED IN COCKPIT. EMERGENCY DECLARED AND AIRCRAFT RETURNED TO MYR LANDING UNEVENTFUL. FOUND FAULTY GASPER FAN, DEFERRED PER MEL 21-24, CONTROL M120626 PER MX CONTROL. REMOVED AND REPLACED GASPER FAN PER MM 21-24-21, OPERATINOAL CHECK NORMAL. (M)