sorry for the annoyance you are experiencing. I have a couple things you can try..the part that concerns me is its the left shift key. The left shift, option and command keys are all tied in together and its possible its an issue on the logic board, not necessarily the keyboard. The only way to know for sure is dis-connect the keyboard, then plug in another keyboard via usb. If the external keyboard works no problem, chances are replacing the internal keyboard will fix the issue, although keep in mind liquid corrodes over time so the issue may re-surface. If it is the keyboard, I can also provide you some links to purchase a new one, but also a guide how to install (which I am in the process of creating anyways)
I've provided a link showing how to remove bottom case (it's 10 screws), just make sure you pay attention at the top which screws went where. It should be from L to R, short screw then 3 long If you put the long in where a short should be, you will screw into the optical drive (don't recomend this! lol)
MacBook Pro (13 Zoll, Mitte 2010, Unibody) Gehäuse-Unterseite ersetzen
the keyboard connects via a flex cable. What you want to do is lift the lever and pull it out. Just be very careful to not damage the lever/arm. The photos below show you:
photo 1: the connector you are looking for
photo 2: the lever up and flex cable ready to be removed
one last thing to mention, you will need to boot the machine from the power pads on the logic board. If you can post a photo of your logic board in that lower corner near the keyboard (just edit your question and use the "Images" tab in the lower left hand corner of the screen, I will post the photo back with the power pads circled. It's very easy to do
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