We have a Kenmore he3 front load dryer that it several years old. (maybe 9). It has a very loud and annoying knocking noise. I have replaced the rollers, belt, and tensioner "roller". The knocking continues. I removed all of the tub fins and made sure they did not have any coins or other noise making items. Removing the top and lower front panel and turning on the dryer reveals that the sound appears to come from the same area as the motor. I am not sure what else to do. The dryer works fine but the noise is making us crazy. Any help would be greatly appreciated.

Dryers - Kenmore