Key on Yamaha MODX88 making strange sounds

I’ve got the MODX 8 digital keyboard with the C# above middle C making frequent strange noises and a slight clunking noise. It’s the only one on board that is doing this. Anyone taken one of these apart before and able to guide me through it?

From Yamaha Service Info:

SYMPTOM: Click noise occurs when playing the keys.
CAUSE: The hammer hits a screw that fixes the keyboard assembly to the lower case.
NOTE: The symptom depends on manufacturing tolerance of the key hammer and rarely occurs.
SOLUTION: The length of the screws has been shortened from 16mm to 12mm.
It is recommended to change all the 10 screws for the product which has this problem.