Large or very scrappy smaller labs who use that same machine may be able to make good use of a dead or malfunctioning machine, either fixing it themselves or cannibalizing it for spare parts to keep their own machines running. There are also equipment techs who specialize in rebuilding/refurbishing mills to sell for cheap to dental labs outside of the metropole, and who may offer you a non-negligible price for a machine like yours, although I'm not aware of any specific guys who do that with zirkonzahn machines.