I'm trying to help out a contractor friend of mine. he is working on a Trane TTS748A100AO 2 stage ac and the wiring diagram is missing. The last contractor quit on the job and left it not hooked up. the wires are red/black, blue, black, red, and green. I have put in quite a few Trane units but I haven't seen this. I called my Trane dealer and the are bus today and not normally helpful. I was hoping someone here could lend some knowledge so I can help out a friend.