Ouch!! Jim, My old rad(the one with the Harrison tanks) developed a leak in one of the tubes the night before a cruise a few years ago. I soldered it up but then another started just down from the first. And so it went for a couple of hours. I finally got them all plugged but was really scared to take it the next day but did anyway. The point is if it's bad in one spot, and not caused by some sort of trama, chances are it's bad in more than just one place. I would do some shopping for a replacement before you take it for the repairs just so you know if it's even worth the money to fix. What with labor cost these days it might be more cost effective to buy a new one.
