I have the same problem, so I sent my camera to pm2s (maintenance partner for Fujifilm in France), and after 5 months, they answered that the spare part will never be available (should have come directly from Japan).
FYI the part is '''CB2428A200 - Y29971TOP_ASSY''' and would have cost me around 200$ to repair...
Instead, they "offered" to replace the camera with an X-A5 at 500$ ^_^
BTW, did you manage to repair your camera?