My air conditioning nightmare.2000 Grand caravan

Dont scare me about the front evap. Thats a big job.
I did find a leak underneath,where the tubes go into the rear evap.
The smaller tube had a pinhole,enough that I could wipe it away every minute or so. Not much there to be sure,but I assume it's the low pressure tube as its warm. I was desparate to fix it.I've spent ridiculous sums on this in the last 2 days.

So I scuffed the tube and used epoxy putty. Now
im praying that it holds.