[Elecraft] K3 Problem: ERR 12V and failure(?) of KPA3

[jmalloy]

In the past few days, I've noticed the KPA3 in my K3 serial number #584 
acting "flaky".  Well, today it apparently failed -- or maybe I'm 
missing something (?).  No matter what I do, the rig is limited to 12 W 
(or so it says); I've switched the KPA3 on and off numerous times in 
software, I've removed and reinserted the KPA3, I've checked the circuit 
breaker with a VOM out of circuit, I've tried another power supply, and 
so on.  No joy.  Before I contact Elecraft I'd like to hear the 
collective wisdom of the group -- what else can I try to get things working.

Tnx and MC!

73,

Joe, W2RBA