Could be the drum rollers, 349241T
or the idler pulley, 691366
or possibly the motor, 279827
. To gain access to these parts, remove the top four screws from the rear panel. Pull the top forward and off. From inside the dryer, remove the two screws securing the front panel. Lift up on the front panel to remove it from the clips. Note the routing of the belt before removing it. Remove the drum. Once you have it apart, you should be able to find the culprit.