As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(EMERGENCY DECLARED) EN ROUTE TO STL FL 300, ELECTRICAL BURNING SMELL OCCUPIED WITH SOUNDS OF ELECTRICAL SHORTING ARCING INCREASING IN INTENSITY / FOUND ELECTRICAL ARCHING/SMELL DUE TO BLOWER FAN FAILING. PERFORMED TSM 21-26-00-810-809A. R+R 20HQ VENT BLOWER FAN IAW AMM 21-26-51-000-001A + 21-26-51-400-001A. ALL OPS CHECKS GOOD. "