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IT probably cracked from vibration and arc'd repeatedly to make it appear burned.

I don't know if it could cause the amp to cut out but if it's the only rectifier for either rail, it could cause the amp to drive DC to the output which could cause some amps to shut down.
 
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This amp has 2 MUR3040's side by side. (this is the old zr style dx amp)
No Dc on output when I checked before I took it apart.

The amp just didn't seem to have the power it had before.
I thought maybe the crossover card solder joints were the cause till I saw the burnt rectifier.
 
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I seem to remember this being an issue with DX700, and replacing them with a hardier case style. It's been a number of years, so I can't be sure. If you are still having an power issue, I can dig up service notes and advice.
 

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