What was found
ON DESCENT FOR LANDING, THE COCKPIT CREW AND THE F/A NOTICED AN ELECTRICAL ODOR CIRCULATING IN THE COCKPIT AND CABIN. THE CAPTAIN COMPLIED WITH THE QRH FOR SMOKE, PULLED THE CIRCUIT BREAKERS FOR THE RECIRCULATION FAN, AND THE ODOR SOON DISSIPATED. MX INSPECTED THE FAN AND ALSO NOTICED AN ODOR. THEN, WHEN AN ATTEMPT TO RUN THE FAN WAS MADE, THE CIRCUIT BREAKERS WOULD IMMEDIATELY TRIP. THE RECIRCULATION FAN WAS REPLACED.