My Problem
Trackpad was acting cray-zay - cursor would jitter and jump around, open mission control (3 finger swipe gesture), randomly scroll (2 finger gesture) etc.
Confirmed it was only the trackpad by using a mouse and turning the trackpad off. No known spills and the battery wasn't bloated.
My Fix
Easy peasy. Took ~30-40 minutes to replace the trackpad, dust out the inside, swap in a SSD, and pop some new ram in. Machine is like new.
My Advice
Check the clicking action on your trackpad once you have it screwed in place and before you reassemble anything. There's an adjustment torx screw on the front facing underside of the trackpad. In my case, the trackpad was just flopping around not clicking and I had to tigten the adjustment screw a bit.
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