[Elecraft] KX1 died. Where to start?

[Oscar, WB5GCX]

Don,
  Removed and re-seated the MCU.  No change in operation.  Also closely
inspected for no/bad solder -- all looks good.

  Kept thinking about if I could have done anything to cause this.  I
remembered I had both the KX1 and my K3 connected via 18" jumpers to a coax
A/B switch to share my main HF antenna.  Was doing some receiver comparisons
between the two, and have used this configuration to easily use the KX1
indoors with the main antenna.  Always before I have always disconnected the
coax from the KX1 before transmitting with the K3 (as well as moving the A/B
switch to the K3 position).

  The last time I had the KX1 hooked up this way, I may not have removed the
coax from the KX1 before using my K3 on 40m cw, and 80m SSB.  I'm not sure I
tried/used the KX1 after doing this.

  Could strong RF from the K3 maybe have "fried" the KX1 MCU (or other
component)?  Perhaps the A/B switch isolation is not so good -- or stray RF,
etc.?

Oscar, WB5GCX
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