This sounds a lot like a problem I had installing the KNB2 (which
still isn't solved, regrettably). The cables between the top cover
and the main boards of the K2 have a variety of connections, and they
can get flexed in taking the cover off. In my case, the ground
shield broke at the KAT2 -- somehow this allowed strong signals to
leak through anyway, giving a mostly deaf K2. Resoldering the shield
and removing the KNB2 restored full receive. (I'm still slowly
trying to figure out what's wrong with the KNB2).
Tracking the complete receive path is hard. Look first for bad
connections where signals go in or out of the added modules.
And keep telling yourself you'll get it working perfectly someday ...
Peter N8MHD
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