There's a leak, that's true enough, but how do we know it's a coolant leak?
I think Caveman's advice is good, it's better to verify a coolant leak than to just rip into it.
On my brick for example the coolant is green, so if I saw a leak like that on mine, I'd go hmm, doesn't look green, what's it smell like. I'd look for leaking signs around the vacuum hose. If none I'd look for signs of dampness in it while cranking, or after cranking. Or bubbles in the coolant while cranking, stuff like that. This would only take seconds, and could save a bunch of time. The vacuum hose is on cylinder three, the leak is on cylinder three, coincidence, maybe.
I've fixed leaking head gaskets a bunch of times, where coolant was leaking into the cylinders, without removing the head. On all of those occasions it has always been on an outside cylinder, coincidence, maybe.