Yikes. I never thought about saving a copy of the CM instructions, either for loading or building. I can give rusty memory, but that's it.
First and foremost, the modem might need flashing. My Relay had a properly-dated modem, but my wife's didn't, even though we bought it a few months later. Somewhere I have both old and new modem zipfiles, because I had to back-flash in order to get my GPS working at one point. I don't know where they are at the moment, but I'm sure I can find them.
Next, you need a more up-to-date recovery. I've been doing my own builds late last year, but I never tried one of the recoveries generated by the build process. However I just checked and have the 20160815 recovery, which is what I believe I'm using.
I'll see what I can do about condensing some of this stuff. It's going to be on a new thread, when I do.