[duke of earl]

Tim,

I used to work for Trane and have done many of these compressor changeouts. I would not change the other compressor unless it has a problem. When you take out the old compressor, use a hacksaw and cut the pipe as close to the compressor body as you can. Remove the compressor and get your rosebud hot and remove the old compressor fittings from the piping. Be careful with the oil equalizer line when removing. I always drain all oil from both compressors before starting removal. This helps when brazing the oil equalizer line into the new compressor. Use Trane Oil 45 for replacement oil. Clean debris from refrigerant piping after cutting with the hacksaw. The debris will be caught by oil on the walls of the piping so it won't travel far. I would add some acid away to each compressor for insurance and of course new liquid line filter driers. If you have to install a suction drier use a removeable core type and install it in the common suction line. You don't want to leave the cores in the system for any length of time. Make sure and check crankcase heaters cause no cch will kill these badboys.Also log out circuit and find the cause of the failure and correct deficiencies. Good Luck.