The components being heat-sinked are probably drawing too much power, either
because they are about to quit and go total short condition, or whatever
they are supplying drive power to is causing them to draw too much power. I
have seen X-sus main output components with the large heat sinks short out,
but so far never the Y-sys. A lot of the time the components being heat
sinked are proprietary, and seem to have these heat sinks sonicly welded to
them permanently. The only way to do a repair is to do a board swap with a
known good board. Good luck.

I think you hit the problem dead on. The Y sus board is getting quite hot
but the x sus isnt. Any idea what would cause the board to consume more
wattage and therefore get hot?