Thanks for the replies. Unfortunately I didn't find the drawings I needed but in the end I did not need them. The problem I had was that 1 of the motor blocks stopped running. When I took it apart I was some what surprised/shocked to find that the long established coloured wiring that was so easy to trace is now all black 2 core cable with a fine white tracer on 1 core. 3 wires had become disconnected from the motor blocks (1 at 1 end & 2 at other). Is this progress or just cost cutting?