D-pad and analog stick issues.

Hi, I have two Xbox 360 wireless controllers that are both now encountering issues.

The first both analog sticks and action buttons work correctly. The d-pad, however, will trigger "B" when pressing "right". The other d-pad directions work correctly. I've taken a quick look at the board and cannot see any obvious damage.

The second all buttons and triggers work correctly, but the left analog stick is intermittent in responding to inputs.

Is there any issues I'm missing in fixing the above issues, or ways to combine the parts to obtain a fully working controller? I do have basic soldering tools, but am very much a beginner in skill level.