[Elecraft] P3 problem

[Ross Biggar]

My P3 has been working perfectly until this afternoon, but suddenly it has stopped showing any signals on the screen.
I can still see the base noise, (at say –135db) but no signals. It is communicating to the K3, as the K3 frequency is being shown
on the screen and the frequency alters as the K3 is tuned.
Ideas please as to how I get the P3 to show signals again.

Thanks
Ross ZL1WN