[Elecraft] K3S Birdy on 28MHz

[Conrad PA5Y]

Hi all, I just discovered a birdy in a very awkward place on 28.360MHz. I use the K3S with a transverter for 144MHz and 144.360 is quite awkward as it is the centre of activity for MSK144 MS in Europe. The birdy is not really loud and is not coming from anything external. Is this a known birdy? Is there anything I can do to get rid of or move it?

Season's Greetings

Conrad PA5Y