GRJ,
So I took the (arguably) easier route and swapped the CC-Ms since I didn't notice this mismatch pre-upgrade. The problem follows the CC-M.
Now, the question is - which one is bad? Check this out, I noticed something a little different between the two boards...
One is green and one is black/brown! Now I know manufactures often change PCB substrates and whatnot, but these are likely from different generations. Both do have the same 2007 copyright year and have a sticker that says "CRM- 6.0" on top of the microcontroller.