Troubleshooting at Mesa Revolver Speaker Cabinet

[Phoenician]

My new to me Revolver cabinet has a problem where it will drift of up fast mode and not come back down to slow. It’ll usually hang out on slow for a bit but soon enough it kicks to fast. Any thoughts on how to troubleshoot this issue in order to resolve it?

 

[Phoenician]

Bump

 

[Phoenician]

Bump.

 

[user 84685]

Vibration and electronic components don't go too well together. Could be as simple as a connector or lead issue.
I would look for dry joints if you are technical with a good grounding in electronics servicing otherwise, take it to a messa specialist.