Quoted from Hogey:
I sold my DE Tommy to a buyer in Chicago (Wrigley area). Now the game isn't holding it's settings. The battery holder was sporadic in the past but now is the culprit I'm sure. I'd like to get someone in the area to install an NVRAM in his board to fix the issue once and for all...that's four hours from here, so would like some local help. I told him I'd pay for it. Please advise if you're in the area and can help a fellow pinhead out.
Two great Chicagoland area pin repair guys:
Rick at http://www.ricksgamerepair.com/
Gavin at https://www.yelp.com/biz/gavins-game-service-schaumburg
Rick is my absolute go-to guy for pin and vid repair.
I've met Gavin and I know he has a great reputation, but I've never personally used him.
Not knocking Gavin (I have many friends that have used him and say he's great too), but I know for a fact and personal experience that you can't go wrong with Rick.
Just my opinions.