Re: Stat yourself
Talent may be part of it -- I got into tool repair because I'd been fixing 50-80 year old camera shutters (for which, then, there were no readily available service documents and were and are generally no parts). I gave myself Talent (Artisan), which fits almost perfectly, though I should probably temper that with Incompetence (Electronics) given my discomfort with anything component level involving transistors or microchips.
I'm also very good at fixing stuff I've never seen before (for example, I fixed the hammer spring in a Saiga shotgun -- essentially a 12 gauge AK -- having never seen any AK up close, never mind seeing one disassembled, and using only a Leatherman multi-tool). I have a running joke at work that you can fix anything with a hammer, if you know where to hit it. I have no idea what to call that, in game terms, but for now, I've got it on as Wild Talent (Mental) with Retention (seems like too many points, but I don't know anything else that fits). As a result of that, if something comes in for repair and we have to look it up on Google to find out what it does, I get to fix it. Hydraulic torque wrenches, water system pressure testers, banding tools, capstan hoists, power feed magnetic base drills, and so forth.
Beyond that, I don't know if the other techs where I work have Incompetence, Laziness (Learning), or Self-Conscious -- I just wish my boss wouldn't make it my fault when I "waste time" by answering their requests.