For board repair: Barakandl, ChrisHibler, JohnWartJr and Borygard (sorry if I forgot anyone). They don't all do all systems so that would be worth noting.
Calico1997 has led bumper caps (sold through PinballLife if it matters).
Quoted from Glarrownage:Does anyone know if Paul of VirtuaPins is on Pinside?
NoahFentz