The post below is correct, try the TDPRI.COM tele board, theres alotta good people there and over the years I’ve seen some pretty interesting setups on those. : I own an early 80’s Fender Telecaster Elite and I noticed a circuit board in it that has 4 groups of component markings but only 3 of them are used. Can anyone tell me why and can I use the extra group to "improve" my axe…or should I just pretend that it isn’t there?

I believe the same board was used on the Strat Elite too thus explaining the extra group. I have found schematics on the net using a general search.