Open a support ticket with Thrustmaster. I had a problem with the china hat sticking and they sent me a replacement assembly. If the switch is bad then it should be a very easy fix.
_________________________
AMD FX-8350 Vishera @4.0Ghz, Coolermaster Hyper 212+, Gigabyte 990FXA-UD5, XFX Double D Radeon HD 7970 3GB, 16GB G.Skill RipjawsX DDR3 1866, Thermaltake Black Widow 850W, Creative X-Fi Xtreme Gamer, WD 250GB SATA2, WD 320GB SATA2, 90GB OCZ Vertex 3 SSD, 128GB OCZ Vertex 4 SSD, Saitek X52, Saitek Pro Flight Pedals, TIR5 with Trackclip Pro, Win 7 Ultimate x64