My outlane gate makes a loud buzz noise at hold open, so trying to diagnose and fix. Anyone else have this issue?

It functions fine, and understand there are numerous posts on getting it to work properly. I'm about half way through this thread and tried some searching already. It's a mini-coil magnet that pulls in the bracket, so no plunger/coil stop to file/smooth. Happy to take out, etc. but not sure what good that is going to do. I thought about seperating coild and bracket to isolate source. Also, the coil test in the service menu is just gate open then close, so don't hear the noise. It's only at hold open in game play, so have to trigger the hold open during play to troubleshoot. Unless there is another way to test?

I was able to resolve the relay buzz. The extension bracket to the diverter rod was slightly bent. Bending it back allowed the mechanism to function properly, so no more rubbing/loud buzz.