If you did not see the actual spider - that's fungi growth. Looks like spiderweb, too. And it affects the optics profoundly - if left for too long. The only way to find how much damage was done is to clean the stuff off professionally - you don't want those spores all over your house, and primary cell assembly and collimation is a smart business in refractors. Considering the possible cost of all of this - not much resale value there might be. Sorry.
As a best case scenario, after you pay the cost of fixing it - you'll have a good scope back. Tak may be worth it.
P.S. It's not the first time I hear about this problem with Tak. Does it mean anything?
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