[Elecraft] K2 alignment problem 20m and 17m

[DM1GP - Dr. Guido Pelz]

Dear K2 specialists,

I recently finished my K2 with (more or less) no problems. Everything is
fine, expect the transmitter alignment for 17m and 20m. Here are the 
symptoms
found while doing the alignment with 2W output in tune mode:

1. On 20m, the output power is rapidly changing between 0.1 and about 9W.
2. On 17m, I have a problem reaching 2W output. The maximum I get is 0.5W.

Any idea?

73,

Guido - DM1GP