This may be a very simple fix. I have the same amp. Take off the screws on the top of the amp. Inside are 4 rail fuses 2 on each side. If any of those fuses are blown the red light will not go out. Check or replace those fuses and you will be back in business. Shouldn't take more than 30 minutes ad it may save you some aggravation. I was back in business for $6.00
Need recommendation for repair service in CA bay area - McCormack DNA-1
My DNA-1 powers up but the protection circuit won't turn off so the amp never outputs audio. It has a red led (protection) and a green one (power on). When you power on, they both come on and the red one should go off after 15 seconds or so when the amp is ready to work. The light stays on.
I unplugged input cables and output speaker wires. Same problem. I plugged into a different outlet / circuit. Same problem. I removed the over and didn't see anything obviously burned or loose. Checked all 5 fuses - all good.
So time for repair.
Please let me know of a recommendation in the California SF bay area ideally.