Start by looking on eBay. It would help if you could narrow it down to specific parts. Find someone parting out a baler and send them a note asking if they have your part(s). Many will often comment about a buyer needing a few specific parts.
If knot:laughing:, then a knotter assembly from a 24T is still supplied by a JD dealer and its compatible with your 14T. I believe even the 336 knotter frames plug right in (since I have a 336 frame in my 14T).
If you have any kind of mechanical skill, then a lot of members on here can help you get it diagnosed, apart, reassembled and working once again.