[Elecraft] Low Power on 20m and 30m

[g4irn at ntlworld.com]

I have a problem that another couple of posters seem to have too, however I am not sure what the solution is or if there is anything else that I should check.
 
I have completed K2/100 #4891 and my power output on 20m and 30m is lower than expected : 80 watts on 30m and 55 watts on 20m. Power output on all other bands is as expected. The receiver sounds OK on all bands.
 
Any suggestions please?
 
Thanks
 
John, G4IRN.

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