[Elecraft] Dreaded ERR 12V Message

[Gerry Kersus via Elecraft]

While operating 20CW with about 100 watts, my K3 (S/N 1428) suddenly displayed the dreaded ERR 12V  message. The circuit breaker did not trip. I was not able to operate even at low power until I powered off and then back on. I was able to operate again, but it would intermittently display the message again. I was able to operate fine with 10 watts (after powering off/on) This happened on other bands and on SSB.  I noticed that as I turned the power level clockwise  while listening that the background noise noticeable dropped with the power level went over 12 watts. I also occasionally got the message even while not transmitting.


Any other advice (besides replacing the KPA3 power connector)?
Thanks,
Gerry, W1GD