Melisa:
Bart Thomas Emailed me that you are in NJ. Approximately where in NJ?
You mentioned something about putting the trees in a green house.... Do you have a garage
If so, I'll explain further for your other trees..
Concerning the sick tree. This is not the time to be repotting or changing soil... right now, we want to get you through the coming winter.
If you did see green on the trunk, then there is life in the tree.
If you have an area that is protected (say between bushes and will get Southern exposure, you might dig a whole, place a ceramic tile at the base of the hole, sprinkle a little soilon the tile and slip the tree directly into the hole. Water the surrounding soil well.
Check the bottom of the pot, it may be wired into the pot. Try not to disturb the roots.
Do not fertilize.
Let me know how you make out.
You can eEmail me privately if you wish.