Disklavier

There are some other things you can try.  The latest technique I  have had good luck quieting dampers hitting the strings is to take an emery board (disposable nail file that looks like sand paper) and GENTLY brushing the damper felt,  Usually one pass is enough.

The clunk in the damper pedal is probably one of 2 adjustments.  If the pedal travel is great (like more than in inch)  there is an almost invisible screw (called a capstan screw) attached on the underside of the piano over where the damper lever travels upwards.  You can turn that screw down to limit the travel of the piano.

If you must push the pedal down more than a 1/4 inch to get the damper felts to rise, then the pedal rod need lengthened.  You do that by turning the nut on the top of the damper pedal rod.

Also check the felt on the pedal lyre that contacts the top of the pedal when it is released.  It should be soft.

Also, be mindful that not all MIDI files have good pedal data.  Sometimes the data indicates the pedal is either on or off.  I get this on my own Disklavier when playing MIDI files I downloaded from the internet.

Sometimes the pedal solenoid on a Disklavier needs to be adjusted.  I believe the clearance is 15mm.  You might be able to check this by laying down underneath the piano and looking through the slot on the cover over the pedal solenoids.  If you press the pedal all the way down and you have not seen a little red LED come on, that is a good indication the solenoid needs adjusted,  Most piano technicians are not familiar with pedal solenoid adjustments on the Disklavier.

Hope these suggestions help!    Carol Beigel