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Hi Simon,
Personally, unless you see material flaking off the belts I would not replace them. If you do have the original black belts you will most likely see this. The new belts are grey and should last a long time. Certainly feel for any looseness but also do not over tighten!! If you need belts I'd get them directly from Software Bisque. Seriously though I doubt you will need any parts.
There is a video on line showing how to replace the worm block. You need to remove it to properly clean and grease the ring gear. Be careful because the video skips an essential step in the reinstallation, namely adjustment of the 1/4-20 bolts. This is the the literature but not the video. If you don't do the 1/4-20 adjustment you cannot get a good reseating of the worm block into the ring gear.
Please post your before/after results re tracking and PEC. Good luck!
Peter
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