Dynamic damper failure EDCSVL, required to replace shocks in pair?

[grr]

Another day another failure of some sort...

This time it is the dynamic damper system that is failing. I read out codes which said 00633C EDC SVL Control unit: internal fault. This is apparantly the front left damper satellite. As far as I can see it is one part with the electronics, part number 37116794531, at about a $1000. I would be fine with just replacing one shock now, but according to my source supplier it is required to replace both right and left. Anyone else heard that before? I cannot see any reason for that. As long as the shock is working I cannot see why it needs to be replaced in pairs. Either it works or not. It should not change characteristics during its lifetime as long as it is electronically controlled... Unless there is some coding procedure that prevents replacing just one?