[Elecraft] K1 lost power on 15m

[G4GTU]

I recently lost about 75% power out on 15m on my K1-4 (#1219) for no 
apparent reason. Regardless of the 'out' setting, I am now only getting 0.8w 
out. The other three bands are all normal. Same condition whether I'm using 
antenna or dummy load. Rx performance is fine on all bands. R36 is soldered 
in place. I tried re-alignment based on comments in earlier list postings 
relating to a similar problem but with no effect. Before I start pulling 
things apart, it would be really useful to have suggestions from the list's 
collective wisdom for possible suspects. For information, I have a KAT-1 
installed and use a WM-2 qrp wattmeter for output measurements. Thanks in 
advance. Regards and 72 de Steve.