Question about Kitchen Ranges
It appears that you have gone further than many novices or even technicians would go on repairing this problem using an Ohm Meter.
The +V terminal of the heater relay on the old board being charred is not a good sign.
I don't have a lot of time to answer this question but did find a site on Kitchenaid.com that has quite a few .pdf files that you might find helpful in diagnosing the problem, although, they seem to be a bit less technically oriented:
Posted on Jul 13, 2010
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Posted on Jan 02, 2017
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