David
I called Bachmann US today and talked to Laura.
For warranty repair in the US you need to contact [email protected]. The parts folks sell items, the service folks deal with warranty and repair so you need to talk to the service folks if you do not wish to purchase parts.
They do have some Trucks and stirrups for the effected Murphy Roof box cars in stock. Normally the warranty is short for rolling stock but they are trying to help out their customers for these cars.
You need a dated sales receipt. They will try to work with you if you do not have one but that is their policy. Part of the reason for this is because with prior issues they sent far more replacement items then the number of items that were effected.
Being in the UK it is a tad more difficult. I would first contact service in the UK and explain the Bachmann US replacement policy for this product and ask that they contact the US if they have problems. Please also note that the replacement trucks, trucks sold as a product and other trucks in the Sprectrum LS line are not effected by this problem.
If they do not have the replacement parts then you can contact the US folks and they will try to work with you.
I was informed that when they discovered the problem in the US that they replaced all the trucks for product in stock so not all cars in the effected run have bad trucks.
Hope that helps
Stan