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They usually have a Zener diode on one of the power supply outputs to short and blow the fuse in case the PS puts out too much voltage. Look for a Zener across the 12V output to ground, something like a 1W 15V Zener, or maybe a little higher voltage rated.
Do you have an ESR meter for capacitor checking? I can't work on these with all the bad caps without one.
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