As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT CRUISE FL 280 , ELECTRICAL BURNING SMELL AND OVERHEAD VENTILATION BLOWER FAULT . THE SMELL DISSIPATE AFTER VENTILATION BLOWER WAS SWITCHED TO OVRD. MAINTENANCE REPLACED THE AVIONICS BLOWER FAN IAW AMM 21-26-51-4.