[Elecraft] K1 output

[raimon]

For the atton. to Don Wilhelm W3FPR

Dear Don, I need again your help (I got your help time ago, for my K2 
100, my problem was easily solved)

My K1 serial nr. 493, revision D, with Firmware upgrade Rev. 109, and 
with KAT1, has been working flawlessly for some years.
Now, after some months QRT in my shack, I tried it again, and a problem 
appeared:

No matter what is the Power Out setting (I can modify output setting), 
when transmitting no bars are shown, in Tune mode shows P 0.1, and I 
cannot change power output with WPM, Same behaviour connected to a dummy 
load.

I removed KAT1, (I did not forget the jumper in J2), and the problem 
persists.
Connected the K1 (without KAT1) to a dummy load through an Oak Hills QRP 
wattmeter, it reads 2 watts no matter what is the power out setting. No 
bars in the display.
When I transmit, the signal can be heard in a nearby receiver, at the 
frequency shown in the display.
Reception is working OK.

So I proceeded to the Transmitter Signal Tracing

These are the readings (40 meter band)

PRE: 0.049 V
ATTN: 0.014 V
OSC: 0.08 V
MIX: 0.082 V
BUF: 1.581 V
TRI: 0.702 V
BPF: 0.422 V
TR2: 0.387 V
TR3: 0.000 V
DRV: 1.63V
PA: 16.15
ANT: 10.17 V
RFD: *0.02 V*

I suspect a bad solder developed over the years.
Where should I look for this failing behaviour?

Many thanks in advance for your help
Raimon Pardos
EA3EZO
rfuidio at telefonica.net