There are some errors in the 93 service manual. Some of the relays are indicated in the wrong or contradicting places (I believe the ELC relay is one of them). I also remember references to dual-zone climate control that don't belong. Also, code 66 cannot be cleared from the climate control display because it is stored in the PCM. You must disconnect the battery. I seem to remember the supercharger section being deficient in describing how the oil level is maintained.

If you're referring to locations within the Maxifuse/Relay Center, they're (sort of) interchangeable in the sense that if you pop out all the relays at once, you can reinsert them in pretty much any order you want. The last idiot working in that area (not me, a different idiot) had done exactly that. There is a diagram in the manual that shows which locations they're officially supposed to be in, but also a note indicating that you should identify the relays by the wiring harness colors, not the location. (I think the fourth-from-the-left socket is for the high-speed-bypass relay on manual-A/C (C61) cars, which is marked as vacant on cars with the electronic (C6 A/C system.)

Heh. That would be nice to have... (ISTR the Buick B-body has that, though which year they started it, I don't know.)

'kay...

There isn't a whole lot on the supercharger, no. They do point out that it has its own silicone-based oil (IIRC) and doesn't share it with the engine, but it'* a little short on detail, apparently since it regards the supercharger as a component replacement item rather than a rebuild-and-reuse item.