Behringer is junk ,,, you should know that . . .
The A500 is a pretty good amp. Solid state, the torodial coils in it are very impressive... it’s about 9 years old, so not too bad.
Lucky I had a single backup.
Suggest you replace it with a single dual channel Crown. Be about the same price as the two amps you are replacing and way better. (https://www.amazon.com/dp/B01AD1R4A4?psc=1_).
As a professional musician, I appreciate that Crown stuff is the royalty of live sound power amps. Bulletproof. I have one hooked up to my home Bose stereo speakers and it’s flawless.
BTW, Behringer is not crap. I have had many pieces of their equipment over the years (headphone distribution amps, line mixers, small mini-mixers, etc.), and they work fine. Are they as good as the more expensive stuff they copy? No, but they are a great value and generally last a long time.
Not anymore - Behringer is pretty much leading the industry in Digital Mixers. I have both the X32 and the XR18 - and they are simply the best pieces of audio gear I have ever owned. Sound is incredible - and function is the best. Love mixing with a tablet!