1.

Remove the covers from the unit and locate jumper wire JP-15. Cut across the trace isolating the junction at R69, and JP-15, from the rest of the circuit. (R69 & JP-15 still together)

2.

Solder the expanders whke wire to the R69, JP-15, side of the cut trace.

3.

Solder the expanders green wire to the other side of the cut.

4.

Solder the expanders red wire to the on off swach. (+13.8VDC)

5.

Solder the expanders black wire to circuit board ground.

6.

Solder the small 100pf capacitor from the center pin (three pin side) of L3, to the center pin (three pin side) of L4.