Stannah 260 won't move, Green light not on ?

I have a Stannah 260.
The chair will not operate (ie, it doesn't move when pressing the up/down buttons).
When I turn on the power switch on the chair arm, the green light does not illuminate.
The master switch is on.
The yellow charging light is illuminated.
The batteries are new with about a 13v reading.
The 9 diagnostics leds on the main PCB are all off.
Any idea on how to diagnose this?
Are there any jumpers to enable diagnostics via the 9 PCB LEDs?