...nope. It died, and I think I may have found the leak - although weirdly enough, it's not red (which gives me doubts). The high side line where it meets the condenser (on top) has some wet stuff dripping from it - there's some green stuff underneath (looks like mold, but I'm sure it's just oxidation or smth), looks like it's built up for a while (it was like that before too, btw). The point is that it's wet, and it's not red - in fact, I touched the wet stuff (this is after car off for 24 hours, ofc), and the spot on my finger it left was bright yellow/green.
Have I found my leak? It doesn't seem like the actual metal fitting, because I don't see any cracks or whatnot - also, it obviously holds some pressure... maybe a bad o-ring? I'd love to be able to just swap that out, but I'd have to evacuate the entire system, so I don't want to get it wrong. Also, why is it not red?