[Richard]

Yes, a MAPP torch will sweat silver solder. I had to prove it too myself, cause I wondered if I could do it on the road.

You can watch the utube about soldering with silver. It is quite different than normal water pipe. Cutting to the chase scene, no flux, get it dull red, and let the solder stick touch the metal after the pipe is red.

If you get to that point, we can help with the superheat/supercool charge of the system. If I remember correctly, the Dometic uses a capillary tube and not a TXV,

Amazon sells a nifty little slide rule calculator thing that figures it our for you. https://www.amazon.com/HVAC-Superheat-Su...RydWU&th=1

Or if you are John, you have the cutest little sensors that screw onto the pressure taps, and send the info to an app on your phone, that does it all for you.