I'd remove or replace those line to chassis caps if you plan to have that radio plugged in unattended for any length of time...They are time bombs at this point in their lives.
I'd try variacing it the chassis out of the cabinet and see if it smokes again and where...If it does not smoke look at all the wiring on the chassis and clock and see if anything could be moved by flexing or bumping into something during installation in a way that could cause a short. Magic smoke can come from anywhere so finding the general vicinity of the source is key to diagnosis.
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