I am not sure whether this will be of any help, but I have a fairly new CPC-11 and have recently adjusted collimation due to annoying coma. On my scope there are 3 philips head adjustment screws under a lift off plastic cover at the centre of the corrector plate (where the secondary is). It was a bit tricky using a screwdriver (a product called "bobs knobs" can be fitted in place of the screws to make adjustments easier), but I did manage to remove the coma fairly easily by slightly turning a couple of the screws. I found the following to be a useful resource:
http://legault.club.fr/collim.html
I hope this helps - good luck
Regards
David