The BEVAN AVIONICS repaired radio came back to me, was installed, and seems to be working well! That is the good news...
I sent it in for refurbishment in Aug of 2023, got it back in late January of 2024, and put less than a dozen hours on it before it failed. So, I sent it back and Tom on the bench repaired it at no additional cost even though it was several DAYS outside the 90-day warranty.
So far, so good.
Tom at BEVAN AVIONICS made it right.
So, there are TWO places you can send your old MX-300's...
BEVANS and ELLISON avionics - both work well and do the repairs for a comparable price.
My personal strategy is to keep THREE of these MX-300's with two in the plane at all times and one in ready storage or refurbishment.
I have one I am sending to ELLISON soon so I can have all three in FMC (fully maintenance capable) condition. A glass panel is out of the question with me, so I will keep these old, heavy and (mostly) reliable MX-300's working until it's time for me to stop flying in the next 5-7 years...