I agree with all the above comments regarding the Westchester OH quote; totally out-of-line. I also agree that your first call should be to Ryan Kilpatrick at Audio Classics in Vestal. They are known world-wide for their excellence with all things McIntosh, and Ryan has helped me a number of times over the years with some very odd problems. Check them out: https://www.audioclassics.com
Good luck and let us know how it all ends up working out.
Joyous and safe holidays to you!