[Elecraft] K2/100 ALC or Power problem

[J F]

Hello All,
I've had a problem crop up that has me scratching my
head. 
I have K2 #3311 with the KPA100 and the KAT100. It's
possible this problem has existed for a while, but
I've just noticed it when trying to rebuild my
antennas after a microburst attack. I can set the
power level, according to the front panel from .1 Watt
to 110 Watts, the relay clicks in at 10 Watts and the
indicator on the ATU shows the change from high to
low. Unfortunately, the low level is about 20 Watts
only on a power meter, and high power is only 110
watts, no adjustment. I'm not getting a Hi Current
message as well. Any suggestions where to look? I've
checked for burnt components, open R50, I don't appear
to be getting any KPA100 bias voltage. The Cal Cur is
set at 2.00 (did try adjusting it to 3.50 Amps, per
the KPA manual). It had been operating correctly, but
have only operated sporadically for the past few
months.

Thanks in advance,
Julius
n2wn