[Elecraft] K3 External ALC Mod

[Roy Morris]

The mod revision sheet of the digital IO board shows the 69.8K soldered to pin #1, and the 100K soldered to pin #20.  The remaining leads of these two resistors appear to be soldered to pin #9 along with one end of the 137K.   The other end of the 137K goes to who knows where.
The cut trace does not show clearly what trace is to be cut and where the 137K terminates.  It is also unclear if the 69.8K, 100K and the 137K resistors are just soldered to each other or are terminated to Pin #9.
Why is it necessary to use 1% resistors?  Are these values critical to produce -4 volts of ALC?  
Roy Morris  W4WFB
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