Blown (shorted) output transistors. With an Ohm meter (power OFF) these will read something very close to 0. Drivers can be damaged too so don't just drop in a new pair of outputs and fire it up.
Less likely it could have blown the bridge rectifier instead of OR in addition to. Bridges are more likely to fail _after_ the power transistors because some yahoo installs a 15 amp fuse and blows out some more parts.
G²
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