Let me see if I can help a little:

Disc 1:

Fixing the connectors
Lots and lots of board and component repair work
Score displays

Disc 2:
The driver board
Sound and speech board
The Game (cabinet and stuff)
- Rusty legs
- Reconnecting the boards
- Under Playfield examination and repair
- Examining and repairing connectors
Going to an Auction
Some Cosmetics
Powering the game on

Then they blow things up

There are chapters but they're a little hard to find since there aren't chapter 'stops' as far as I can tell. Both discs are very very linear and much more organized than previous discs since this handles the examination, teardown, and rebuild of a specific series of games.

All the discs are worth it, in my opinion.