Two things you may not have to "debraze" it if you habe enough room to cut the pipe before and after the txv. The system is r22 which means using two couplings you can solder it with silver solder and not have to braze. That uses a lot less heat.
Second thing if you don't have a vacuum pump...
I bought this on ebay Module Atmega328 5v 16M+USB2.0 To TTL 6Pin CH340G Converter F Arduino Pro Mini.
http://pages.ebay.com/link/?nav=item.view&id=191146731721&alt=web
I'm going to take a stab at flashing a stc1000 controller that I purchased following the github's instructions. Sorry if...
Did you fix it? If it's a weep hole take a screw driver and a hammer and hit the weep hole it may seal it instead of trying to reflow the braze. There's no pressure behind it so it's not critical like a compressor. Remember your not trying to put the screw driver through it. You just want to...