I had this problem this morning and this is how I solved it.
Remove all the screws.
Open the case until you see the electronics boards inside.
Encircled in red is the potentiometer's location.
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Remove the two screws to loosen up the potentiometer and the gear
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Readjust the gear of the potentiometer.Do a trial and error until the clicking sound disappear.
Reassemble the unit.
Do a pedal calibration. Press and hold "Pedal Assign" thne on the unit.
Plug in your guitar.
Enjoy.