Hi, Having fitted all 4 boards to my 7000, hope this helps.
1/ Turn keyboard over and you will see a panel fixed by 6 screws mine also had a cable tie looped through it,remove this panel.
2/ You will now expose the 4 sets of sockets, these are marked with small socket numbers,I can't remember if the lowest number is left or right, but if you went and bought a KN7 you must be smart enough to find the lowest pair of numbered sockets .this is the set for EW01 and then fit the boards in there sockets
3/ Replace cover plate and thats it!!
p.s. hope you turned off the keyboard and unplugged the mains lead before starting work!!!
Regards John.