Sorry.. Not an everyday kinda member.
I basically learned from just playing around with broken circuits and experimenting with different effects. There is a lot on the internet as well.
I have built just about any kind of analog effect you can think of. More Tubescreamers than I can shake a stick at. Modding them is fairly easy for me. I have done OD, distortion, compressors, tremolos, flangers, vibes, chorus, on and on..... I have also built pedals from scratch with just a schematic and the required parts.
Pedal repairs are fairly simple. It is often the parts needed and the time invested that cost. Some of the older pedal parts can be quite high.
If anyone is interested, PM me and we can discuss this. Be it as a hobby or if you need help fixing something.