To clarify, these components are not populated in production systems as you can see here:
So this is not your issue. Can you fill us in on what’s going on which keys are not working?
The keys you marked share three column lines:
- The first being the 9, O, L as well as the colon key
- The second being the 0, P, M and equals key
- And the third is the accent, return & arrow keys.
This is common problem when there was a liquid spill which has damaged the keyboard switch lines under the keyboard keys.
Basically, you have a grid of X lines and Y lines and the key shorts across these two lines to create a circuit the computer understands as a given key symbol.
Sadly, there is little you can do to fix this other than replace the keyboard unit MacBook Pro 15" Unibody (Mid 2009-Mid 2012) Keyboard its a bit of a job as you need to strip down the uppercase to get to it, here’s a great Youtube guide: 2009 Macbook Pro 15" A1286 Keyboard Replacement which is the same process for your system.
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