You could try the Upgrade World mod.
https://valheim.thunderstore.io/package/JereKuusela/Upgrade_World/

it has the option to reset just a specific location and can be targeted to a fairly tight radius around the co-ordinates. But if the spot your trying to fix is in the middle of another structure it probably won't help much.

Also having the Map Co-ordinate display mod active will help
https://www.nexusmods.com/valheim/mods/907

Hope this is of some use.