Hardware ZR trigger on Pro Controller not registering a press.

[Git2Gud]

Basically the title. It's a PowerA Pro Controller, everything works fine except for the ZR button. It still clicks, feels responsive, should work. But it won't register a press - ever. Any help? I tried taking it apart and cleaning the part under the trigger but I couldn't actually get the trigger itself off to clean thoroughly, so I did what I could. Didn't help, but I didn't break anything. If anyone could tell me a solution or how to take the trigger off, that'd be greatly appreciated!