To @robeffy WHY does it have to be a "new" amp - why don’t you try and locate someone within 2-4 hours driving distance (if doable) and simply get someone qualified to go through your EXISTING Mark Levinson 532H and fix it? When it not dropping a channel do you like how it sounds now? When you meet a capable tech who also does checks and upgrades, it’s worth its weight of the amp to consider this too. You might seriously consider this, even if it’s overnight drive and stay. Sometimes the solution is sitting right in front of us, fwiw.
They may replace the main power filter caps and check all of the output transistors and check/adjust everything to make it whole again for you. Heck If you were closer, I’d buy the amp from you needing repair, and get it fixed properly and keep it myself and play it on rotation. You’d have a hard time convincing me your existing amp is not worth saving. Best of luck to you.

