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Received a new part for the heat sealer. What arrived wasn't the cutout size I was expecting, but it is the size of the original panel which I removed a few controllers ago. Dug out the old panel, mounted the new controller in it, and that's ready for installation once the current packing shift is done.
Right now the old controller is in its pre-hard fail mode just sometimes not bothering to send power to the heating elements where turning it off and then on again usually fixes it, but that means it's only a matter of time before that fails more completely so it's better to just swap the part now.