Hey thanks, for the suggestions. The printer is for student use in a university library, so we have an IT department that handles all the maintenance for it. Because of it, we're not really allowed to check all that stuff ourselves, I just wanted to see if that's what fixed the original poster's question/issue.
As far as I can tell everything is well lubricated, and the print head does move fairly easily when the machine is off. The shifts are occurring left to right, pretty much exclusively. Could there be any software issues causing this? Since we got the printer we were using the 15.06.03 beta version, and weren't having any issues. Sometime in the recent weeks though we switched to the 2.1.1 64 bit beta, but the shifting wasn't really occurring when we switched versions.
Thanks for the help.