[Elecraft] Troubleshooting dead subRX after adding filter

[Pete Smith N4ZR]

I just finished installing an 8-pole 400 hz factory filter in the subRX 
of my K3, and was congratulating myself on a straightforward and easy 
process ... until I reinstalled and tried the subRX.  It is not 
receiving anything at all - I can hear internally generated noise but 
that is it.  There is no change in the sound or level of the band noise 
when I switch between filters.

I've checked and rechecked the crystal filter setup, the TMP cables, 
etc. Before I tear it open again, is there anywhere in particular I 
should be looking?

73, Pete N4ZR
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