I know this is no help, but I owned an A3000 for a little while, and while I loved the design of the thing, it often gave me strange 800004 GURUS for no apparent reason. It also did other strange things like not recognize certain hard drives my A2000 would recognize, and when some devices were plugged into the external SCSI port it would not turn on at ALL (pressing the power switch did nothing (not even a power LED) until the device was removed (this, despite careful termination).
I remembered the A3000 would GURU when AmiDock in OS3.9 was launched at startup, for instance.
So while I loved the A3000's design, it just did too many wierd things for me to want to use it over my A2000 (plus it was damn tight to fit anything inside and it ran hotter than an A2000).