[Elecraft] KPA-500 Fault - follow up

[Edward]

All,

I tried to firmly seat all of the connectors.  No change.  I finally pulled them out and only used the keying cable (RCA to RCA).  No change. One thing I noticed is that the KAT 500 was giving me Power and SWR reading, but no amplification from the amplifier.   And if I had any more than 12w of drive power from the K3, the amp would not give me any reading at all. Dropping it back to under 12w, the Pwr/SWR readings would be visible again. 

I decided to disconnect the antenna from the KAT 500 altogether and connected straight into the amp. Low and behold, I now have the amp working again!  

Hence, the problem is with the KAT500 tuner.  I am thinking that a factory reset would do the trick. Question is, how do you reset a KAT 500 to factory default? The manual states to do it with a computer.  Any buttons I can push on the tuner itself for restoring the factory defaults?

Thanks,
Ed NI6S