As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)THE PILOT REPORTED HEAVY STATIC ON THE COMM AND VOR FLUCTUATION OF UP TO 5 DEGREES. AVIONICS TRACED THE PROBLEM TO THE AVIONICS COOLING FAN MOTOR WHOS BEARINGS HAD WORN OUT AND WERE BEGINNING TO DRAG THE MOTOR ROTATION DOWN. A CHECK WITH THE HISTORY OF THE AIRCRAFT REVEALED NAV FLUCTATIONS AND DECREASED VOR RANGE COINCIDING WITH REPORTS OF A NOISY FAN MOTOR.