[Elecraft] KAT500 - Blinking Mode Light

[Clay Autery]

Situation:  Tuner inline between K3s and known good dummy load.

1) Tuner off - K3s tunes 1:1 instantly
2) Tuner on in bypass - K3s tunes 1:1 instantly
3) Tuner on, and in Manual OR Auto Mode, tuner clicks and then Mode
light starts blinking.

All components in signal path obviously AND tested known good.

Any ideas where to start troubleshooting the malfunction?

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Clay Autery, KY5G