I'll bite Volvo...
I do all my own servicing, most of my reels are Modded up Penns that I use, So I know just about every inch of them.
For the internationals, I found a good site where full services were really well illustrated, in fact there's a bloke there that does write ups on most brand reels, so you get a complete strip down, assessment and a put back together, with upgrades he would recommend. He's done everything from Stella's to cheaper shimano's, so a very good source of info when your even considering buying a particular brand reel, there's not many he hasn't reviewed.
I still have notes and refer to his writings, the grey matter doesn't always retain and remember information as it used too anymore
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A couple of years back, I was one of the guinea pigs for concussion testing or it's long term effects, got another session coming up next year, So that's my go to excuse when I sit there with a stunned mullet look and can't remember drag spacing orders.
Some good YaYa tube tutorials about, but a couple of reel sites I'm in go way more in depth and are a good reference point when serving your own reels...
Col