After less than 10 days, my Fuji X-T1 is already back from Fujifilm’s factories, where the light leak issue got fixed. I tried to take a 30s exposure with the lens cap on the lens while directing a flashlight into the side panel with the cover open, and true enough all I got was a completely black frame with no sign at all of light leak.
The body was also completely cleaned before being sent back directly to my home, and all that for free. The following letter of apology and explanation on what was done to the camera was included for the package (Japanese only since I live in Japan…). Well, to be honest as i cannot read Japanese, this is just my guess 🙂