I'm sure you know they are obsolete. I recently upgraded my basements to the new control board and digital thermostats. But my problem was caused by the boards. I've looked at other options but there doesn't seem to be any a/c's that are sized the same to fit in the basement areas. You might try to find a local a/c guy that doesn't mind taking the time to locate the individual parts. My a/c guy serviced my 3 last year and said he thought he could locate a compressor or condenser that might fit. But that route would probably be more expensive than roof airs.
If you decide to replace them with roof airs you might contact Steve Mcgown, he replaced his a couple years ago. Good luck.
Also check your wires at the compressor, evaporator and control board and make sure the connections are secure. Can't remember who but remember reading recently someone had a problem with the connections.
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