Crestworth Galaxy Fibre Optic

[Ford Prefect - NPNG]

Hello All.
I know its been a while, I've moved away from collecting now as my poor pockets just cant take it!

I've got a minor problem with my Galaxy fibre optic, in as much as the motor has stopped turning the coloured wheel, so the colours dont change  :(
The fan does still work though.
Anyone who can give me any details on what motor to replace and especially how to go about changing it would be mch appreciated, as i've never tried to dismantle one and am afriad of damaging it.

Maybe somewhere instructions still exist?

Thanks guys
:)