[Jerry's 2LT]

The way it was explained to me as I watched the service writer testing mine before the repair, when lowering the top, if you see it is retracting with a slight tilt, that is the problem.

The bias to one side or another causes the framework to move from a smooth up/down motion to a slight sideways motion. That framework then makes contact against the panel.

The bias and tilt is the result of loss of hydraulic pressure in one of the cylinders.