I would like to find a shop that repairs radiators.

I'm not quite sure what you mean by 'rod and clean up' your 'perfectly good radiator'. If it's not leaking or restricted internally, I would simply recommend flushing the coolant, which should be done periodically to maintain the radiator, as well as checking the condition of the attached hoses and replacing if needed. Please respond with further details if there is a problem with the radiator that I haven't understood from your question.

Haven't heard that old phrase 'boil and rod' in so many years, almost forget!!!... Today's radiators no longer require that service!... As stated a good flush should do the trick... IF you still have radiator problems... Replace it!!