Assuming this is the same noise as I had, service removed the bash plate cleaned and then re-torqued. I have also heard reports of adding a thin layer of material between the two. I would ask service what their repair guide requires for a fix. I'm sure they've had enough experience now to know what works in the case of the noisy bash plate.
If I remember correctly,, I tried torquing myself, then the service center said they re-torqued but it did not work. It was only until the next service center removed the plate did I have success for the last five or 6000 miles.