[Stylin' Audio]

Hi Jules, this describes the problem I had exactly. It was a blown resistor on the power supply. There is a ribbon connector to each fader module from the PS , the faulty component was beside one of those connectors on the PS board. It was sending rhythmic voltage peaks that were freaking out the fader board and causing the faders to spasm. You could swap the ribbon connectors of 2 fader banks and see if the problem goes with it - that would show whether the problem follows the controller board or power supply connection.