PowerBox Systems PowerBox Cockpit SRS Instruction Manual page 22

Press the SET button twice to move to the next screen display:
The undercarriage should now retract. If not, hold button I pressed in
until the valve is triggered, and the undercarriage retracts. Press the
SET button to move on to the next stage of the procedure.
Connect the nosewheel door servo to output 1. Press the SET button to
close the nosewheel door; repeat the procedure in the next set-up
screen to open the door.
The succeeding steps are used to set up the rear wheel doors; the
procedure is identical to that described for the nosewheel door. The
servo for the right-hand wheel door is connected to output 2, that for the
left-hand wheel door to output 3.
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