The control board has one Rework eliminator on it and it's for the KAF2 or the KDSP2Elecraft modul. If this Rework board was not included in the kit build and you wanted to add either the KAF2 or KDSP2 you would have to take the K2 apart add the SIP connectors J1 and J2 to the control board board. But also remove two resistor (R18 and R19) from the control board. With the Rework kit it's plug and play! When building the K2 kit Elecraft has done their best to make it a very easy and fun experience. I found it to be a whole different ball game when a board is built, tested and installed to have to remove parts! There is de-soldering wick,
Rework board removed
de-soldering pumps and also the Hakko 808desoldering tool (which by the way is well worth the money I have one and it's great). The way I look at it just to much can go wrong when removing parts on a finished board.....why give Murphy the upper hand!