The big one you're talking about is the modulation board, and is the usual one to fail, and your has done it at the usual place. The other board is the one with the ignition stuff on it, which is called the Full Sequence Board, and fails less commonly.
It's worth changing rather than mending - there are probably blackened relay contacts and other nasties by now. Takes about 3 minutes..
Most of the original Linxs I have seen have failed because of a water leak getting onto the mother board and causing arcing under the power inlet choc block on the left.
Luckily we have a few still in stock as they are getting a bit thin!
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