Bucket seat bolster button has disappeared!

[rs4nick]

Don't know if anyone has had this before but one of my bucket seat bolster buttons has disappeared (pushed) into the seat base housing. Inflation still works as when press sport button the seat does as it should plus managed to push button with finger through hole and still seems to work!

Does anyone know (or got advice) on how to get plastic trim around bolster buttons off before I attempt and risk breaking it! Hoping switch just needs refitting back to trim (perhaps being too hopeful). If not do people think this will be covered on warranty?

Thanks for any help