Electric switches in mechanical musical instruments create ozone.
Not long ago, a well-known typewriter company noticed that the rubber
components of their typewriters were deteriorating rapidly.  The
problem was discovered: small switches were arcing and the small amount
of ozone emitted from the switches was the cause of rapid deterioration
of rubber.  Once the switches were changed the rapid deterioration
stopped.

Would the starting switches in piano motors emit enough ozone to speed
the deterioration of rubber pneumatics?

Bruce Clark