Was this an issue with Tron ?
Was there a fix ?
I didn't realise there was an issue like this with Tron Nino . I've had my Tron for a couple of years now and haven't noticed any black marks on the balls .. ever !
Apparently, the exact issue happened - black marks on the ball and playfield. Has something to do with the black pad on the disk. There was an aftermarket clear pad that can be purchased that alleviates the issue. It seems that not all games have the problem. I don't want crud on my game - so I'm happy to buy the clear pad if need be. Interesting to see your game didn't have the issue.
A lot of these issues are going to pop up now that the game is having it's first week on route in the USA. Fantastic reports so far - but the black crud is not consistent to all the games.