[Elecraft] K1: No output on 18MHz

[Stephen Prior]

I get full power output with the four band board on 40/30/20, but not a
thing on 17m.  The receiver is also dead on 17m.  I have pulled out the KAT1
and the four band board beneath and checked visually - all looks neat.
Plugged the boards back in, still the same.

I have only had the radio a few days and haven't had much time to check it
out so I cannot remember whether it was like it when I received it.
Unfortunately I didn't build it, so diving into the manual 2/3 of the way in
is tricky, but I have read the appropriate bits and I am no further forward.

I'd be very grateful for any advice please,

73, Stephen G4SJP