Problem Solved....
There were 2 separate issues.
1. The communicatiion cable between the 2 units was damaged and not sending signal. Replaced the cable with a new one.
2. The control board in the new "zone 2" AC (the back unit) was damaged. dometic sent a new board and when replaced everything works great.
Thanks to all for your assistance.
To Summarize:
I replaced 2 "old" Dometic Penquin AC units with New Dometic Heat Pumps. Replaced the old 4 button thermostat with new CCC2 10-button thermostat. Replaced the communication line between the 2 units. Unit 2 came with a bad board - replaced by Dometic and now everything works awesome.
Thanks again.