Credit display looks like it failed. Can see a smoky stain near those thin glass tubes in the middle, which I think are fusible links.

Odd to see the large red plastic inserts on that NOS field. I have the usual large blue inserts (banana shaped) above the playfield flash lamps.

High Speed was the best game of it's time, alphanumeric displays, pulse pounding music, great flow, rotating light & speech (good in-game and for the attract mode). For good or bad it is a simple game. A skillful home player can roll over the score past 9,999,990, but a long game of High Speed becomes boring and repetitious. Taxi is the better game IMO, better sound and speech, plus it also has good flow, and there is much more to do on the playfield. The Taxi topper doesn't grab as much attention as the rotating police light, but it works well enough.

I've found the wiki is often helpful. Changed two Zener diodes from 100V to 91V on all of my games, displays slightly dimmer, cooler, last longer.
http://www.pinwiki.com/wiki/index.php?title=Williams_System_3_-_7