Buyer trying to collect $$ to do home improvement

Hi, Here is my probelm. I live in AL. 6 months ago we sold our house in MN. We just recieved a letter from a lawyer representing the buyer of our MN home. They want $3000 to replace windows in the house they bought.

Here is where I have questions about our rights in this...

We disclosed that fact that two of the windows were in need of future replacement due to vapor between panes. On the original purchase agreement offer the buyers requested that we were to replace these windows prior to purchase. Our counter offer indicated that we would NOT replace these windows due to our time limitations, but we did add other things (like washer and dryer etc) to our counter offer.

THis counter offer was then accepted by the buyers, and the fact that we were NOT replacing windows was initialed by them.

Now, 6 months later, they are sending us a bill stating tht we need to pay for ALL the windows to be replaced.

Where do we stand as the seller???
Vapor problem was disclosed.
home was not inspected for/by buyer
request to replace windows was denied.
this denial was accepted by buyer.
Now buyer wants not 2 but 12 windows replaced at our cost

[HomeGuru]

You are not liable to replace the 2 windows tht the uyer bought as-is but you may be liable to replace the other 10.
Why?
Because you may have failed to disclose the fact that the other 10 windows could also be defective just like the other 2.

Do a search on this BB using seach words, seller disclosure, home inspection, leakng basement, leaking roof....for additional information.