If you need the documents and the Homeowners Association will not give them to you, the only alternative you have is to sue them and get copies.
As for your neighbor, you can cut the branches that grow across your property, but you cannot cut the tree down. You should get a tree surgeon knowledgeable in this area because if you do anything that kills the tree, he can sue you, even though you had every right to cut the branches. As for the roots, you should protest this in writing. Send the letter to your neighbor by certified mail and send a copy by regular mail. Put him on notice that the roots are growing onto your property and you are putting him on notice right now in order to prevent damage to your property by the roots in the future, and that you will look to him for all damages caused by the roots.
If this does not work with the neighbor, you will just have to sue him. You can tell him in your letter that you are trying to amicably resolve this problem and hope that it will not have to go to Court.
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