This happened to my X-T1 also - in several different places. Fuji replaced the entire covering.
I also had an issue with the rubber zoom ring on my 18-135 lens bulging. Fuji replaced this too. This was back in March at which time the camera was about 11 months old and the lens 6 months old.
Both issues arose following a few weeks spent in a tropical climate in SE Asia - but it's never been used in rain. I was really disappointed. My conclusion: maybe it's weather sealed against wind, possibly even rain. But perhaps it shouldn't be used outdoors on a sunny day in a hot climate.
