Roll Bar Electrical Problem

[VJC]

Another 129 body member suggested I thread here as well as Tech Help...

1993 500 SL .. Roll Bar dash light comes on and switch light starts blinking intermittently now as often as every 10 minutes .. A quick push on the up or down side of the switch and all returns to normal. When pressed and held,the switch does bring the bar up and down.. What do I do and where is it located...