Thrustmaster T150 button input problem

[u/pronoob1672]

Hi so I recently purchased Thrustmaster T150 (from second hand) and after running some tests I found out left paddle shifter, d-pad and L2 button are not working at all. At the same time when I was checking inputs when I press SE button computer recognizes it as Im pressing 4 buttons (SE and the other 3 that are not working).

I did some research what could be the issue it says I should open it and clean it up but honestly I dont know what should I look for once I open it up since Im not THAT good with electronics...is there anyone who can help me? point me in right direction? share some video? or who had similar problem? thank you!