As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DCA - FLT 6529 - EN ROUTE BOS-DCA - A VIBRATING NOISE WAS HEARD FROM UNDER THE COCKPIT. AN ELECTRICAL ODOR WAS THEN NOTICED, FOLLOWED BY A VENT "BLOWER FAULT". THE VENTILATION BLOWER WAS PUT INTO OVER-RIDE, AND THE ELECTRICAL ODOR WENT AWAY. FLIGHT LANDED IN DCA WITHOUT INCIDENT. MAINTENANCE REPLACED THE AVIONICS FAN. OPERATIONALLY CHECKS OK. (M)