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Another good idea is, before connecting the plug, to check the resistance at the chassis interlock terminals. If it is below 40 ohms (calculated assuming 350W rated consumption, and the same resistance cold as during operation) then assume there is a problem and fix it before connecting power.
That char mark reminds me of the time when I was a teen when I tried to find which pins on a 4 pin power plug were 120V. I used a DMM set to voltage, but with the leads in the 10A current measuring position (which is a dead short) there was a POP and lots of smoke....Surprisingly nothing was destroyed and the breaker never tripped.
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