Apple IIGS logic board dying???

[ToasterKing <ToastBrain@prodigy.net>]

Help!!!  I hate to see such an elegant, revolutionary & dedicated machine
die this way!!!

I have a ROM 01 IIGS that I've had for 9 years this December 25th.  It
looks like this year has been its last.  I have an AE GS-RAM III memory
card, Apple II High Speed SCSI card in Slot 2, AE Transwarp GS
accelerator in Slot 3, AE Sonic Blaster sound card in Slot 4, and Gibson
Light Pen in Slot 7.  I also have a System Saver GS on it, and a 130-Watt
power supply (power supply is definitely not the problem.  I built and
checked this one myself.).

I experience random crashes, weird errors that just shouldn't be
happening, etc.  A text screen will switch to a low-res GR screen and
freeze, it will hang sometimes when accessing the 3.5 drive, sometimes
when playing a game it will freeze and I hear the horrible "bong bong,
bong, bong bong bong bong bong..." of the system error beep, usually
something going on in the Apple II monitor, and forget trying to run
GS/OS.  Weird stuff.  It works better with the accelerator card out,
though still far from perfect.  The problem just seems to be getting
worse.  Once I got a "System Bad:  0B040000" message in the built-in
logic diagnostics.  Could someone decode this for me?  I'd hate to have
to use one of Nathan's FAQs.
I have already had problems with the IWM chip, specifically in accessing
5.25 drives.  It will only recognize up to one 5.25 drive connected, will
not read the disk at all with the write-protect notch covered, and reads
and writes to 5.25 disks like a drunk maniac (Yes, I've tried using a
different drive.).

So, what does it sound like?  Irreparable IC damage?  And what could be
the cause?  Heat damage?  I ran the GS for 6 to 7 years with no fan, with
only the AE GS-RAM III memory card installed, though I didn't think this
should be a problem.  What's your suggestion... new logic board???

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                      -ToasterKing-
                  SpongyToast@prodigy.net
     "This is your sponge in the toaster.  Enough said."