Poor prints. Think it may be mechanical

Hi Guys,I have a Creator Pro. Lately noticed the the prints are no were as good as they used to be. I have been doing some tweaking in Simplify 3d, but not fixing. There seems to be a slight rattle/vibration coming from the machine, and by look of prints, I think it is a mechanical problem (bearings, etc), but dont want to replace everything. Have included a picture of latest prints, and interested in any ideas and where to start.Attachment 16434