TrainsRMe,
Actually, it can be fairly simple to fix your loose window strips. There are two screws in each end cap, one on the top and one on the bottom. If you remove these the end caps just pull straight out.
I agree that spreading the sides of the car body to remove the chassis can be a challenge. But it is totally doable without damaging anything, it can be done by hand, but is hard on the fingers.
But the good news is once the end caps are off you can slide the window strips in and out. They are not glued, they actually sit in a groove, which can be seen once the end caps are off.
Please let me know if this helps, or if you want to discuss further. I actually have cleaned up 7 or 8 of these cars, they are easy in my opinion, because they are aluminum and polish up so nicely.
Aflyer
