I would like to know. I would like to know where to send my husbands Minolta zoom 19514845 to be

Question

I would like to know where to send my husbands Minolta zoom 19514845 to be repaired. It is called a Minolta zoom stanard zoom, 8x-20x50, 3.1 degrees at 20x. The zoom does not work. You can focus without the zoom but with the zoom you cannot focus. Also needs a cleaning.
thanks
donna