Garage Door makes loud sound when closing

My quantum (Wayne Dalton) garage door has suddenly started making a loud grinding type noise only when it closes. The door opens just fine and only makes this sound right as it closes. The sound seems to be coming from the powerdrive. Everything else seems to be fine, it's just the loud noise that is concerning. I've lubricated the tracks, joints, and gears. I also played with the force adjustment and train open/close settings to no avail.

Can anyone provide their thoughts as to what the problem may be?

Thanks.