[Elecraft] [K2 processor noise]

[Vagner Emílio Fischer]

Hello there
During the first hours of operation on my K2 sn 7063, I noticed that, when attempting to copy a weak signal, with AFIL 1 on and maximum AF gain, I hear processor noise. After that, I realized it  is everytime I have AF gain in the vicinity of maximum. I hear it, during reception and during my keying as well. I know its processing noise because it "changes" when I push a button or turn a knob. (I have KSB2, KNB and KAF2 instaled.)Any ideas how I can troubleshoot?
dePP5RLC - Vagner