At average cost of ~$400-$500 per dimmer/keypad, plus few grand to run data/cat back to hub, $65,000-$80,000 is a lot of switches!

If house is that large, $80k to get the house working for pending sale is not that much in a grand scheme of things.

Even if he could find someone in Colorado to come out and patch the system, it would still cost at least $10k in travel/logging costs, there would be no guarantees, and if next homeowner found out about it, he could go after previous owner for 'hiding' existing issues.

That system needs to go and get replaced with something current -- period.