My hit8s has worked great for the last 2 years but when I went to start yesterday I got a "43 ORD1 PLC-CPU not ready". I went into diagnostics and started the NCK and it worked fine. Made my parts. Started it again today and same error/fix. The 9v lithium backup battery on the cpu is at 9.2v. Replaced 2 years ago. Is there a second battery in this system? My 840D simodrive system has batteries on the CPU and on the NCK. I cant find any reference anywhere to a second battery on the 840c.