[Elecraft] KPA 1500 Remote input 13 broken

[Art Nienhouse]

*/I have been using my Icom 7610 for about two years driving my KPA1500 
amp via the Remote jack 13 on the rear, setting up the menu in the 7610 
and the 1500 all worked just like it is supposed to .
The cable to the ATU remote on the Icom works for the ATU [TUNE] 
function its a great combination.

Tap the Icom band button the amp changes bands the ATU finds a match 
from memory without any RF transmission its worked 2 years..... now it 
does not it just stopped working.  I can not remember any event that 
caused it to stop seeing the CI-V data input.

I have confirmed that the Icom CI-V is working correctly so the problem 
is with the KPA 1500 remote jack not working.

What should I look for?
Corrupt firmware?
KPA 1500 Utility fault log?

Any help would be greatly appreciated
Regards
Art
ka9zap
/*