Problem with a particular lot

I've built a ranch on the Red Roan-lot in Chestnut ridge. Originally it was built as a residential rental, but was later converted into a single family home, in other words a normal residential lot. I played on the lot actively for months, without ever having any issues with it, not when it was a rental property or when it was a resident. 

Then I while back (a couple of months) after having played another family for a while, I had trouble loading the lot. Endless loading, no matter what I did. Eventually I followed steps I found here, travelling to nearby lots and going close enough to see it, moving the family out and then in again, removing all my mods and then loading the lot, uploading it to the gallery with no mods and then putting it back once mods were installed again. 

That's when I noticed a weird thing - even though I had removed all the mods from game, before loading the lot to my library, when I went to get it - cleaned off mods - it still said it was modded. This struck me as weird but as it still worked, I didn't think much more of it. 

Now the same lot refused to load again, and I have tried everything and then some. I have replaced it with other lots then downloaded the clean lot and restarted - it won't load. I've moved the family out and in so many times it's annoying - it won't load. Today I finally got it to work, after having moved the family out, replaced the lot with an entirely different lot, gone into buildmode and replaced the new lot with my old (mod free but still counted as modded lot) and then moved the family in. 

I thought it was fixed. 

Then I open up the game a few hours later and the error remains. Better exceptions throws an LE saying it's a "routing_component" but I don't know what that means. Again there is no cc on the farm, I've played it extensively for months with no issues so why is it now unplayable? The lot is a part of a longer story, and I really, really do not want to remove it from the game.  What can I do?