[Elecraft] K3 Display Won't Shut Off

[Jim McCook]

When I plug the ACC connector cable for the KPA1500 into my newly 
acquired spare K3, the POWER button doesn't shut off the backlight in 
the display or the P3 that's connected to it.  As soon as I remove that 
connector or shut off the PS, it powers down normally.

This doesn't happen with the other K3 using the same cable.  All is normal.

Looking in the archives I saw something about a D10 removal, but 
couldn't find the specific info as to where it is and what the access 
is.  It was described as an early mod, but this K3 is a later version 
#6695.  Any specific ideas where the problem is and how to fix it?

73, Jim W6YA