408 wiper problems

[Sterly]

The windscreen wipers on our 408 don't work. Power is getting to the motor but I noticed the motor (Lucas 6 wire I think) was getting warm while I was checking voltages on the wires. This suggests to me that something has seized. If I try to move one of the wiper arms the other moves slightly so it seems that the spindles are probably OK. How should I proceed? Can the motor and gearbox be detached and removed from the wiper mechanism? Unfortunately I don't have a workshop manual that covers any of this.

Hope someone can help. Thanks
Mark