ST6001 Smartpilot controller connection to eS127 MFD

My local installer has replaced my E Classics with and eS127 master, eS128 slave, new HD raydome, with various cables, starter and converter kits recommended by our local Raymarine rep. Every thing, radar, AIS, chart plotter etc works great except for the auto pilot. The master MFD does not seem to recognize the auto pilot. I have updated the software on the MFDs. My installer has been on the phone with the local rep and they have not seemed to be able to sort out the issue. Recommendations? Is there a particular tech support person the installer should call?
Thanks
David