Bad CW

[Nanko-2]

CW signal from my K2 sounds terrible ,key clicks and carrier is modulated with a multiplexing signal?
Sounds like a purring cat.
I tested SSB with the carrier suppressing pot fully CCW, now a clean tone.
I excanged the control board (tnx PA2DW) no difference :-(
Thanks in advance for any help.
         73  Nanko  PA0V  
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