MK3S and MK3S MMU2S extruders are very similar, we need just to change few parts, but we have to release the cable bundle.
We need to gently pull the IR filament sensor cable back to the extruder as the sensor will be in a different position. Make sure the entire path of the cable is free. However there is no need for complete disassembly.
⬢Using an Allen key release the M3x40 screw and open the door.
⬢Release two M3x10 screws and remove the extruder-cable-clip. On older printers cut the zip tie.
⬢In case there are zip ties inside the Einsy-case, carefully remove them.
⬢Remove the zip ties on the cable holder.
⬢Keep the textile sleeve on the cables, but make sure the cable can slip inside. It might be twisted around other cables, in such case, you have to remove the sleeve.