[Elecraft] KDSP2's Primary Menu - K2 s/n 549

[Bill Scurlock]

When I tap the DISPLAY button on my K2 to access the KDSP2's primary menu I
get an error message:  E13.1 0.40.  The last time I used the KDSP2, about a
month ago, this menu access worked correctly.  The only thing different
since then is that I removed the K2/100 top unit, and reinstalled the
original top unit with the antenna tuner.  Also, I installed the new 2.04 K2
firmware and the 1.09 I/O controller firmware.

What does E13.1 mean?  Where can I get a listing of the error codes?

The AFIL seems to work fine.  Help.

Bill, K5GCW