[Elecraft] K2-100 SSB distortion

[g4amt at sennen-cove.com]

My K2-100 has an intermittent distortion on SSB whereby the signal appears 
clean `on frequency` but has very bad splatter up and down the band `almost 
like something arcing` to quote my local op who is monitoring it. LSB and 
USB the same; CW clean. Have yet to determine if it is constant with KPA 100 
in and out.
Distortion clears for no obvious reason and does not return despite abusing 
power etc to try and instigate it.
My intial problem is that I have no efficient `in shack` way of monitoring 
this and I need to resolve this.
I have checked and checked again the KSB2 board and all looks ok; have 
searched through the reflector archives and notice someone may have had 
similar and carried out a hard reset with some success ... anyone any ideas 
please ?
Thank you
Terry