Thanks for the input all.. particularly Sylvan. I got the upstairs zone drained, cut away the old pipe, and soldered in the new. Of course I’m now to the point which was probably obvious to everyone but a lawyer… that there is a trick to getting the water to circulate once again. I tried a few things and all I can report back is that lips become extrememly sensitive after 15 minutes and your mouth goes completely numb after 30 minutes of manual siphoning… of course unsuccessfully. Is siphoning the solution at all, and if so, is there a tool that does this mechanically?
Thanks again for the help!