[Graeme]

Is your handbrake light on?

If the microswitch is broken this will stop the mechanism. Its also worth putting your handbrake on and off a few times to see if this clears it.

I think that there are manual roof operating proceedures in the owners manual but thinking about it, these may just be to lower the roof manually.

Sorry I couldn't be of more help.

Cheers
Graeme