I think I've got a bad connection somwhere. The magnetic pickups work fine, but the Variax only works periodically. Otherwise it's dead. Leaving it on a stand by my desk plugged in I suddenly noticed a clicking noise like a relay as it was standing there and found the variax working for a while after that. I then removed the back covers and had a look for badly connected sockets inside etc. Couldn't find any. Pulling the battery out and putting it back lights up 3 LEDs on the battery inticator. If I do this plugged in I sometimes hear the relay-click as the green battery-indicator LEDs light up. The variax circuit remains dead if there's no click as the battery goes in.
Are there spares available?
I've only had the guitar a couple months, but I would prefer to not swap the guitar as I've spent some resources on fret-levelling and fitting a new nut.