Lightshield Problem with Trigger

[JarJarBinks]

My good Gamecube controller has become unusable. Whenever I press and release the right trigger, it still lightshields for a whole second after it's been released. I've narrowed down the problem to the PCB, since I tried switching around parts and in the end any controller that uses the PCB has the problem. Does anyone know any way to fix this? I really don't want to use a different controller, because I've gotten used to the sensitivity of the analog stick on this one.

 

[Kadano]

You can take the stick boxes from your PCB and put them into another one. You can only exchange soldered for soldered and screwed for screwed, though.

 

[JarJarBinks]

The PCB is from a white controller, and it's my only white one. The rest of my controllers all use different stick boxes...