I have a Bradford Exchange "The Wonderful World of Disney Christmas Tree", which is very similar to the Thomas Kinkade Wonderland Express, that also had the same problem of music and lights with no motion. The disassembly was similar to the [guide|101529|Thomas Kinkade Wonderland Express Disassembly], and I needed to use a Dremel Multi-Max Oscillating Multi-Tool to saw between layers (castle) and rest of the tree. Unfortunately, there are no wire connectors as in the example and all of the wires are soldered together, so you need to unsolder them to remove layers. There's also a white plastic cylinder on top of a metal rod (where the reindeer arm attaches), which needs to be removed. I was able to get mine off with a little bit of heat and then pulling upwards.
Once inside the tree, I opened up the motor box. Inside the motor, there was a small red rubber drive belt that deteriorated (and ultimately stretched out) and no longer had enough tension to drive everything (even though the motor ran fine). After trial and error with different size belts, I was able to find a replacement on Amazon, but it's an O-Ring instead of a belt. A package of 50 is $7. ***The O-Ring size that seems to be a perfect fit is 20 mm outer diameter, 18 mm inner diameter, 1 mm width***.
After reassembly, everything works great. Hopefully, the replacement lasts longer than the 3 years the original belt lasted.