Well, the AS 200/400 series Tech Info Doc is located here...
ftp://ftp.netbsd.org/pub/NetBSD/misc/dec-docs/index.html#alpha-sys-as200
...the codes you're looking for, I believe, are on page 8-4 of the book

---   David A Woyciesjes
---   C & IS Support Specialist
---   Yale University Press
---   mailto:david.woyciesjes@yale.edu
---   (203) 432-0953
---   ICQ # - 905818


! -----Original Message-----
! From: B. James Phillippe [mailto:bryan@terran.org]
! Sent: Sunday, September 09, 2001 9:17 PM
! To: bad bob
! Cc: NetBSD/Alpha
! Subject: Re: Newbie seeks advice: AlphaStation 200
! 
! 
! On Sun, 9 Sep 2001, bad bob wrote:
! 
! > With these to responses to the orig questin, can I trouble 
! you folks to
! > ask if you have access to a manual or some explanation of the error
! > codes/count down on power up?  I have two different 
! symptoms from two
! > machines - E5 as the last code before the build date is 
! popped out.  I
! > get no prompt or reaction via the keyboard or on the screen 
! after this.
! > The second symptom is a no leds, no apparent power BUT when 
! I shut it
! > off, the power seems to still be on.  Any hints, pointers 
! to a manual,
! > greatly appreciated.  thanks
! 
! Hello,
! 
! I have a manual for my AS 200, and it contains tables both 
! for the error
! beep codes and the diagnostic LED's.  As for the bootup 
! sequence (the SRM
! values printed), I'm not sure where the codes are documented. 
!  If you have
! a beep or LED code, I can tell you what the manual says about it.
! 
! -bp
! --
! # bryan at terran dot org
! # http://www.terran.org/~bryan
! 
!