Ok,
My plan now is:
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take apart motor and look for any signs of shorts. perhaps learn more tests. because it seems ok.
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replace the 1.7 blown focbox with a 1.6 I have on hand. rolling with the 1.7 on the other side. not blocking on understanding the differences better.
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the replacement 1.6 will go in the existing 1.7 base case. so I don’t have to take all the electronics out. I will reuse the nice thermal pad from the 1.6 which is nice and clean. I will transfer it with tweasers.
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I’ll watch thermals. for variance between the two.
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I’ll order some 8W/mk 2mm thick thermal pads and when they come swap it out.
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observe thermals see if there’s any difference.