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The first place I would start is the candohm resistors. They have a nasty habit of shorting to chassis. If you replace the candohm resistors be sure to unhook all the wire connections to the terminals on the candohms. You cannot use the terminals as tie points for your new resistors. If they are not shorted now they may become so in the future.
Measure all the terminals of the candohms to chassis and see if that is where your short is then disconnect the wire and measure again if it is the candohm or the connections that are shorted. If it is not the candohm then follow the wires and the short to where it goes, disconnecting things as Tom has mentioned until you find it.
Use your eyes and check for errant solder blobs and wires that may be touching.
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Tim
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