The "Impossible" RV Water Leak Challenge - Can A Rookie Pull It Off?!

You may already know that working in an Rv is challenging because of poor design and restricted space. But give me a break!!! Working on plumbing in an RV is the worst nightmare!
This is the kind of problem that tests my strength and decisions...
I needed to share what I learned through this challenge because I couldn't find any video that could help me when I needed it.
I hope that no one has to go through this, but if you do, I hope that my experience may serve you.