The FWC's are in the "right" tunnel area, aft by the pit door, not the left as stated in the vid. I had originally removed the #1 "FMC" not the #1 FWC, I'm 50+, shit ain't working so great as of late.
The reason for testing the Radio Alt's is to find out which FWC is responsible for the audio output. The default is #2. By testing the #2 Radio Alt, a call-out of "40" should be heard. The #1 Radio Alt will test, but no audio will be heard because the #2 is in the drivers seat. When I failed the #2 by yanking the breaker (the #2 was drunk, so the #1 took over audio output) and testing the #1 Radio Alt, I had no audio. That pretty much verified that the #1 FWC was at fault before I even went down to swap them.
The failures didn't show up until approx 60 seconds after power up. Sometimes patience is a virtue when dealing with troubleshooting digital systems.
