While an attempt at boiling the 72-Pin connector did improve things with this NES, it didn't restore it to 100% functionality. I attempted a second boil, cleaned some games, and end up re-bending the connector pins. Tools used in this video:
Giottos Rocket Air Blaster - http://amzn.to/1GhsGtw (highly recommend!)
Contact cleaner - http://amzn.to/1oH0auN
Giottos Rocket Air Blaster - http://amzn.to/1GhsGtw (highly recommend!)
Contact cleaner - http://amzn.to/1oH0auN