Good job! I had a tough one in a fairly new travel trailer a few years aog. I had to remove the shower walls and it turned out to be a rusty staple someone at the factory had accidently shot into a pex line. It held until just after the warranty expired then rusted enough to start dripping.
2002 Damon Escaper (Sassafras). 3126E Caterpillar, Allison 6 speed.