I purchased a K4100 ten years ago and I just recently started to assemble it. Carefully inspecting my work, I used an ohmmeter to check for continuity or shorts and I discovered that one (1) of the twenty (20) CINFP/90 gold plated connectors was shorted internally. I removed the connector from the circuit board to make sure the fault was not with my soldering. Yes, the connector is defective!
Most likely, our Texas service dept. still has a couple of those connectors available.
You can call them at (817) 284 77 85.
We’d be happy to mail you one.