Where did the source of heat originate? If the controller cover is badly burned around a power terminal, the burnt controller could be due to a loose cable connection. If the cables aren't torqued down to spec, this could cause an intermittent connection or not allow full contact, which would increase the resistance of the joint, thus increasing the heat exponentially.

If the cover is not burnt around any terminals, but the damage was confined to the inside of the module, I would suggest sending it back to Crown for a failure analysis. That should shed some light on the failed components and the possible cause.