[Elecraft] KPA3 failure?

[Pete Smith N4ZR]

My K3/100 #4275 has suddenly stopped making 100 watts, and is now making 
10-20 on 160-20 meters, and 45-50 on 17-10 meters , even though the 
power control says it should be making 99 watts.  On the way to its 
current state, it cycled once through reduced power and back to full 
power after a band change, so I suspect something was in the process of 
failing.  Any ideas where to start troubleshooting, or is this something 
that warrants a trip back to the mother ship?

Addendum:  In further testing, with power turned below 10 watts to 
disable the KPA3, I'm now seeing less than 1 watt on 160, 8 on 80, 8 on 
40 and 11-13 on 20-10.  Turning the power back up to 100 watts, I now 
have 20 watts on 160, 35 on 80, 25 on 40, 50 on 20, 85 on 15 and 100 on 10m.

Should I first try recalibrating the TX gain?
-- 

73, Pete N4ZR
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