Queue99
As you can see from the photos, the board and components are corroded due to liquid leakage from the capacitor on the sensor board. The microscopic patterns and through holes are broken and cannot be repaired by simply replacing the components.
Vintage synth craftsmen and board restorers are good at this repair.
The first generation silent stoppers were board-like and difficult to adjust section by section.
It would be preferable to replace them with new silent mechanisms in the RSC3.
SH3 has a better SPEC than SC3.