01 Grand Cherokee Radiator Leak

Hi everyone... wondering if there's a simple fix or if I get the pleasure of pulling the radiator-

I'm leaking coolant (very slow drip) where the transmission line enters the radiator at the bottom. There's a large jamb nut, pretty close to 1" that seems like it would hold the transmission cooler in place inside the radiator. Anybody ever pull that apart?
I'm curious if this is a simple replace a washer behind the jamb nut or if I'm replacing a radiator?

It appears the tanks are plastic it looks like it's possible but if the plastic is cracked your out of luck.