I agree with Wayne regarding the tyres.
I read somewhere, I think in a build thread here on the forum, that this kit in particular was known to be prone to degradation of the tyres, and reaction with the plastic wheels, over time.
I have a Hasegawa Phantom FGR 2 which has vinyl tyres, but mounted on white-metal wheels and, whilst there is no reaction between tyre and wheel, the tyres themselves, after time, tend to 'stick' slightly to some surfaces, although since putting the model on a glass shelf, it's been fine. A similar thing happens with the vinyl tyres on my Dragon P-51D, although again, no reaction with the (plastic) wheels, as the inner bead of the tyres (as well as the entire outer surfaces), and the inner faces of the wheel rims, have been painted.
Conversely, an Italeri 1/35th scale Horch car, buit around 20 years ago, is starting to show signs of reaction between the spare wheel and vinyl tyre, which, unlike the main wheels, were not painted internally. The tyre bead is exhibiting a soft, 'sticky' surface now.
Note that not all tyres of this type suffer the same reaction - it probably depends on the composition and density - but the AMT Tigercat kit is known to have a problem in this area.