I have not had time to isolate---and troubleshoot but here's a quick primer

 

Z3 HU

Rear Video - Black Screen

Sirius Tuner - high pitched garbled white noise

FM/AM - only passenger side mono output

 

Granted, there is Alpine F1 tuner in the mix...and 3 seperate amps for each driver....but I suspect it's the HU that is my issue.

 

Just short of the problems that have cropped up lately, anyone familiar or seen similar issues on the Z