I shouldn't worry about it too much. I have a class 08 myself that's DCC ready and it does make a squeaky noise which I think is normal for this type of model. They do look good and run superbly. If it does start to jerk a bit or the noise gets worse then you best take it to your nearest model shop and see what they say. Better yet get in touch with Hornby via their website and ask them what you should do. They're quick for responding to any questions an problems, believe me!