You need to catch up to caddilac kid on this.
Most important is to have the refrigerant recovered or pulled back into the outdoor unit before you start cutting lines.
If you have the manufacturer name and model number you can look up the technical sheets on the computer and it will give you everything you need to know.
If it works then try not to destroy it cause you can put a price on it and post on here to sale.
If it works fine
I would be interested in it cause I don't want any holes in my roof.