Fujitsu Ducted 12.5Kw AOT45RPA3L

Hi Folks
Working on the above three phase ducted where the system is in fault.
The control diagnosis is E01 comms error, interconnects checkout of with a fluctuating
60-150ac on terminal 3.
The outdoor unit pcb is dead though has 240v power & on board fuse is ok also.
No led's are lit.

Thinking I have a dead pcb & both fan motors are the likely cause, this unit is in a very corrovise
environment near a beach.

Anyone have other thoughts with this?
Also does anyone have a link to a service manual for this model?
Thanks MC