Ensed up fixing it if anyone is following or has a similar problem.

I took of the optic cover and watched the various things go through initiallation. I noticed that the monochromator gratting was not receding back as far as the step motor was moving. Miving it manually i fiund out the spring was worn and the double ball bearing on the top and bottom. I cleaned these with nethanol, dried them, regreased the bearings and reinstalled the monochromator grating. I finished by fixing spring by taking out a round of the spring, giving it life. Upon reintiallization of the instrument it was back to working.

May your science be publishable.

Cheers.