The 6-14105 Lionel Aquarium, my favorite operating accessory, has two "fish belts" that move in opposite directions. The belts in my Aquarium suddenly stopped moving. By removing multiple screws I was able to see that the inner belt was jammed in gears at one of the corner rollers, destroying a section of the belt. To free the mechanism I had to cut out the inner belt. The mechanism now works with only one belt. Lionel sells replacement fish belts, but the belts thread in and around a complex set of rollers, secured at both top and bottom. I don't see an obvious way to replace the belts other than a major disassembly of the accessory.
Does anyone know of a service document for this task, or have a hint on where to start?