First post, but I've had years of experience with these gensets in public safety.
I can't speak to your exact situation, but from experience with these in ambulances and fire trucks over the last 15 years, I'd probably never run mine with the door closed, except maybe the winter. These run HOT, and all of our trucks eventually had vented doors, or vent systems to draw hot air out of the genset compartment. We started with issues with circuit breakers tripping, then a few just said to heck with it and would shut off.
Being in that kind of environment you were in, I wouldn't be surprised of any issues. Have you tried letting it cool down, then trying to run it again with minimal load and the door open? That would be my first try, and if things seem kosher after a few minutes, gradually increase load back to where you were at when you had the issue.
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