I check all connectors, wires, boards, screws, nuts, bolts, etc. amazing what you find either in bottom of cabinet or loose. Of course I inspect cabinet, playfield, plastics and rubbers!

I usually then wait an hour or 2 if winter time (for condensation).

Then I power up and do diagnostics checks etc.

Then put cliffys on.

Then finally play few games.

Then add mods.

Then wax her up and clean glass and put her in her new home for longer term play.