[Elecraft] Line Audio Output Mod

[DBellW6AQ at aol.com]

I'm really confused.  I have a KIO3A, Rev A, C 2007.  According  to the Mod 
instructions this board should need the resistance  modification.  BEFORE I 
began the mod, the resistance across R19 and R20  was about 51 ohms each.  
So how can I put a 51 ohm resistor in parallel  with R19 and 20 and end up 
with a new resistance of between 45 and 49  ohms?  Thinking there might be a 
flaw in my thinking somewhere, I added a  leaded resistor across R20 and 
sure enough, the resistance was now about 26  ohms, so I took it out.
 
What gives?  Instructions wrong?  Am I missing something?   Thanks in 
advance.
 
73, Dave