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Since you have moved out of NY and he is no longer a resident either you will be required to modify the order in the state the child resides in. The courts in Tennessee would have jurisdiction over the case.
I wish you the best,
Your new request significantly is different then the original question so you will want to open a new question for this. Case law can be found on line with a great deal of research. Most lawyers hire paralegals to do this work as it is very time consuming.
I myself do not do case law research due to the amount of work that goes into the research. You can open a new question at this link: www.justanswer.com and if there is a expert available to do the work they will get back with you.