[Elecraft] kpa100 not tracking power with K2

[Pat N8VW]

Having problems with my kpa100 not tracking power with respect to the power
knob on the K2.  For example on 40m if the K2 says 40w the wattmeter shows
100 watts and the current meter on the power supply confirms the latter with
~18 amps.  

The leads me to suspect the power control circuit, but I'm unfamiliar with
its operation.

Any help would be appreciated.

Pat N8vw