applicable units:
z110-140, f10-40, f920-f940, x920-x940, x9310, x9220, u310, f310-320
(all of the above units are based on same software. well 3x0 series are really different units but share nearly identical APL codebase)
applicable users:
advanced users only. if you dont know what you are doing, hit the back button and pretend you never read this post!
So while trying to research various mysteries I keep seeing lots of juicy logging facilities all over the pioneer code. There are some debugging/maintenance menus where you can turn on various logs, but I'm still trying to find out