David, what problem where you having with the Phoenix board specifically? I have a P5 installed in my 38 tonner (& a 2K2 in an original Ely Thomas Lumber Co. #5 which I upgraded to the die-cast trucks). The P5 for the most parts works fine, but I have a rather curious issue with it in that I can't always blow the whistle, particularly on certain segments of my railroad. The 2K2 in the older Shay has no such problems.
Tom
Tom