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I think many of those older convergence boards had a selenium rectifier pack. These were high failure parts and can be replaced with modern silicon diodes provided that you have a schematic showing how the original rectifier assembly is wired.
Since your chassis is solid state, it may be new enough to have individual silicon diodes on the convergence board. Although these are much more reliable than the selenium rectifiers, they should still be checked.
Sometimes, the controls themselves will get so hot that they fall apart after many years of use.
EDIT: Most of the parts on that convergence board can be checked with an el cheapo DMM from Radio Shack, Wal-Mart, etc. Just be sure it has a diode test function. You'll also want to get a soldering iron, solder, and some desoldering braid. Most of the parts will need to be removed from the circuit for an accurate test.
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