in operation

[bosun]

Can I say " in good operation" instead of " running well" in the following sentence?

We are pleased to inform you that the newly set-up )(is it accpetrable?)web service is now in good operation.( .... the newly set-up wev service is runnin well?)

[Barb_D]

It doesn't sound idiomatic to me.
"newly set up" does sound okay, though.

Your newly set up Web service is now operating smoothly.
Your newly created Web site is running well.