[Elecraft] K2/100, half power output on 17-10M

[Jeff Kinzli N6GQ]

My K2/100 (#5945) has been working well lately, until I started
noticing higher output at times, more pronounced with higher SWR
antennas (i.e. it would more often spike it's output power if
connected to an antenna with more than 1.3:1 SWR, the output power
would rise to 140W).

About the same time, I started noticing lower output power on 10, 12,
15, and 17M. Output remains full on 20, 30, 40 and 80M.

Today I pulled the KPA100 apart, went though and checked and
resoldered everything around the SWR bridge, and anything that looked
remotely cold-soldered.

Put it back together, same issue (well, at least the lower power issue).

With a setting of anything over 50W, the max output is 50-52W, as
indicated on the K2 internal wattmeter, or my external wattmeter.

Any ideas why I'd only get half power on half the bands (and this is a
new occurrance, I was getting full power before).

Thanks for any ideas,

Jeff