I had the swollen battery issue with my Apple Watch Series 0 back a few months ago. Calling in they said there was no program but reading the forums I kept seeing people where getting them replaced. I took it into the Apple Store, which I really didn't want to do as it was around the holidays and it took a week to get an appointment, and they said they would send it off to be examined. Within a few days I got a shipping notice and they sent me a Watch Series 1 as a replacement for free.