[mst]

Last time it was around 270 EUR for a ZM 25/2.8, around 3 years ago. That should give you a rough estimate only, though, the actual costs might of course vary with the kind and number of parts that need to be repaired.

I don't know if their customer support is available right now. Most manufacturers continued to offer repair services over the last weeks, but Leica for example didn't. So, you should maybe get in touch with them first.