| I had this on my 748.
I then pulled the plates out and refitted them, and the sound has now gone!
Don't know what I did as the plates went back in exactly as they came out - I marked every single one - so while I know this doesn't help it may be worth spending half an hour doing the same?
Just worth a try as it doesn't take long and is very easy to do... | 
antonye
Hybrid Mode
