As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 280, A LOUD WHIRRING NOISE AND ELECTRICAL SMOKE FILLED THE COCKPIT. ACCOMPLISHED SMOKE/FUMES CHECKLIST AND MADE A DIVERSIONARY LANDING INTO ABQ. EMERGENCY DELCARED, FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND VENT EXTRACT FAN TO BE THE SOURCE OF ODOR. REPLACED EXTRACT BLOWER FAN IAW AMM 21-26-51.