Transmission Oil Cooler Line Leaking

There is a leak by the radiator right by the transmission cooler line. I'm pretty sure its the connector to the radiator, but has anyone else had this problem? Any advice would be great.

I had the same issue with my 93 Sierra and it was the cooler line. The rubber shrinks over time causing the compression fitting to come loose allowing the line to seap. If you had the compression tool you could probably just compress the fitting again and it would probably be fine but I've never seen the tool anywhere. I just replaced my lines and that fixed it but they weren't cheap from the dealer, around $200 for the pair of lines. 3 years later mine are starting to seap again, bastards.