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Sagging floor joists.
Same thing at my house. Did exactly as HayZee518 issuggesting you do. The worst part was unthreading the electrical and moving some hydronic plumbing out of the way. After sistering I still was forced into gluing leveling blocks to the sisters. For a subfloor I used double layer of 3/4 ply crisscrossed to each other and staggered seams. The floor is now solid as a rock. I anticipate it possibly lasting another 145 years!
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