HI
Somnium
it's a PMX
what I followed was this ..
remove 4 long allen bolts to remove cam stop cover
remove 4 screws (3 with washer and one without) to loosen motor
the motor should then slide out once rotated and then you are are supposed to
undo the four screws holding the worm block to remove WB and expose the big gears...
The RA axis in my case is sticking where I can't seem to rotate the motor and pull it clear of the bottom of the worm gear housing- its quite a tight gap and it just doesn't seem to want to come and I don't want to force it.
Its a real bummer as I was all set up and ready to continue and then I had to re-assemble everything and go to work.