I have a personal one which has 4 presets all pulling much shorter shots than usual. Normally double long would be an around 25 sec but now 12. I took the control unit apart to replace the caps on the power board. I pulled the button board off and found these potentiometer 1 near power and 4 blue ? Anyone know what these control? I'm assuming the shot duration because I am not able to program this unit per the manual instructions