If you jump out contacts on voltage monitor does issue persist? I think the orange ones are problematic, you could possibly rap on the side of it with screwdriver handle to recreate issue.

Verifying all DC controller voltages is important on these units. 5 vdc, 15 vdc, and , 24 vdc. Also occasionally pulling all cards and cleaning up edge connectors with scotch brite or pink pearl eraser.

I only mention this because possibly those faults are a symptom of another issue