I recently went thru the same experience re contacting previous owners. Let me give you a huge tip, record the conversation. Go to Radio Shack and buy a little gizmo they sell called a "telephone pick-up". It's a cord that has a rubber suction that attaches to the phone near the earpiece and plugs into a tape recorder. I did this with two previous owners and it has been invaluable. Not only is it excellent documentation, but you'll be amazed at what you didn't hear during the conversation when your gears were turning but pick up later when replaying the tape. I've listened to mine many times and it is quite fun to play for others, especially if there are some good stories. Good Luck.