Had a crash now the rear right arm is flashing yellow when the others are green on startup, then it transitions to one green flash followed by 3 red. I replaced the ESC and it didn't change. It seems to fly, I just tested holding it. No error in the Assistant Software.

if Naza mode it means less than 6 sats...  what is the left arm doing?  Are the ESC's all the same version  i.e. none, 2.0 or 2.1?  Do you know what version the new ESC is?

I thought it meant sats. were low. The left arm blinks green like normal, but doesn't blink red when the other arm is doing it. They were all V2.0 ESC's and I replaced with an extra V2.0 ESC that I had. I did get it to go all green by leaving it outside for a bit, then coming back inside it started blinking red again only on that one arm, so it is sat related, but strange it's only on one arm.

Just test flew it and it seems fine. Maybe I just never noticed it was a single arm flash for lost sats? I rarely turn it on inside except to test after a crash.