[Elecraft] 2 small problems with K2 4498

[Robert DROGOUL]

I had, more or less to change the PA 2sc1969 4 time, since more than two years of usage (and it's working, I did the last CQWWCW contest with it). I have two bans that are not working properly. 1.8 ans 3.5 !
1.8 power = 0.8 w full blast !
3.5 power = 3.8 wfull blast too !
7 = 11 w
10 = 9 w
14 = 11 w
18 = 9 w
21 =7 w
24 = 6.5 w
28 = 5.5 w
I may be a little on the low side but the results are consistant; I did not had any change exchangind the PA pair. All the chain is working correctly starting from the mixer output and the signal tracing does not give me any indication where I may start to look!!!
Any able to help me?
72 from F5UL/Bob