[Elecraft] K2: problems with 30 and 20m filter

[Guido Tedeschi]

Hi  Guys,
    I am restoring a K2 of a friend; he has bought it from a Californian Ham
that sold it as built and perfectly working, but, when the rig arrived in
Italy, we discovered that it was not working and it never worked, because
there were some  errors...
Now I already solved some issues but I need some help for the 30 and 20m
filter.
I aligned succesfully the other bands bandpass filters using a Signal
Generator and a 50MHz Oscilloscope but the 30m (and 20m) filter is
impossible to align.
I unsoldered and checked L8, L9, C19, C20, C22, C24 and C25 and all these
components are fine with correct values, I succesfully checked with an
ohmmeter that the relays K3 and K4 are correctly switched but I have no 30m
signal if I measure it on cathode of D6.
If I place the 10x probe on L2-C9 junction I have some signal only if the L9
slug is fully inserted and I can peak it only if I add a 15pF capacitor
between this junction and ground.
On the othe side of C22 I have no signal at all, it seems like if this point
were connected to ground but it is not so...
Someone has some suggestion for me?
Thanks in advance...
Ciao and 73
Guido, ik2bcp / ab9dg  K1 #1096