[Elecraft] K3 SWR & S meter not functioning

[Gary Smith]

I am working the Stew Perry test and noticed my indicator for SWR & S 
meter stopped not working and that is the same on all bands. If I 
adjust the RF control I can see the level indicated but there is no 
sign of Rf life. I turned off the radio & back on but this persists. 
Is there something I may have bumped to have stopped the display from 
indicating any values?

Thanks

Gary
KA1J