I have a TEK 7903 scope with a broken power switch actuator. It also needs 3 plug-ins, but is otherwise in fine shape. I am not familiar with this instrument or its plug-in units. Can anyone make recommendations, or steer me to a source of their descriptions? If someone has a parts unit, I would like to correspond with him re the power switch parts. Thanks in advance, 73, Allan Kaplan, W1AEL