What was found
PHL - FLT 125 - EN ROUTE PHL-DEN, ON TAKEOFF, AIRCRAT HAD A FLOOR VIBRATION, ALONG WITH A BLOWER EXTRACT FAULT AND AN ODOR OF SMOKE IN THE COCKPIT. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACD THE AVIONICS COOLING BLOWER FAN. OPERATIONALLY CHECKS OK. (M)