Thanks Alvy,
Do not worry I am aware of live voltages in there. My hair is curly enough already!
The corroded parts are really the fasteners used to hold the heaters in place.
The wire connections look good compared to the cheap cad plated fasteners.
Had heat last winter and a/c all summer.
Now have a/c as normal and this no heat problem.
And no, nobody has been inside the cabinet changing anything.
I opened it up to find that one yellow wire not connected and jumped on that as being the culprit.
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