too many modules, close to the limit, and it got hot
or
it got hot
or
it's broken
pull your modules, the power supply might be risky now,
and measure the three voltages with a scope/meter, then you'll know what's next
there's a possibility of a bad module pulling down power or a ribbon cable short too,
but i'd check the +12 -12 and +5, and avoid debugging by swapping things around too much
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