[Elecraft] Error message ERR DSE

[DGB]

I am getting the error message only with RTTY.

It don't matter if I run full legal limit or no amp with the rig power 
cranked down to QRP, so it's not RF in the shack problem. It's fine on 
all other modes.

I searched the archives and read reference to a DSP problem  and 
reloaded the firmware several times over the last few weeks. In addition 
I saw reference to re-seating the front panel board. I disassembled the 
K3 today, did that and most all the other connections.

Same symptoms are there.

The exact err msg is

E 00300 30
ERR DSE

Anyone else had this problem and how was it resolved?

TIA 73 Dwight NS9I