[Elecraft] K1 Low Power on 20M band once ATU is installed...

[N2ZDB at aol.com]

Still have not figured out what's wrong with my newly built K1 w/  ATU.
 
For some reason everything is fine on the 40 M band but once I switch to 20 
 M the power output
drops way down. On the low part of the band the power output is much higher 
 but still too low.
 
I went thru all the C and L parameters in the ATU menu and checked the TX  
output power and SWR. 
 
Here is what I found:
 
     http://n2zdb.com/K1problem20M.jpg
 
Since there are 4 inductors and 5 capacitors what does L0 and C0  represent?
 
Figuring there was a problem with an inductor - I added a short between all 
 the inductors at the relays (pins 3 to 4). This did not make a difference. 
  However when a wire was added to K1 pin 4 to k4 pin 3 the power did come 
up  a couple of Watts.
 
I need an EXPERT to figure this out...does anyone have any ideas?
 
73's Michael
n2zdb