grcond failure (fixed)

[Nigel Brown]

Thanks to all who responded.

The person responsible for the machine going walkabout called in a field
engineer today, who identified the problem as a loose connector inside the
box.

I wasn't present at the operation so can't provide any gory details, except
to say that it is purportedly a common fault.

Moral: Chain your machines to something solid  :(

Thanks
    nigel