Just did our free annual credit reports for my wife and I...surprised as heck to see an account for a Goodyear automotive repair credit account that we closed last year. It was listed as "Negative", though it showed a zero balance and never late. Needless to say we disputed it on all reporting agencies and accounts.
I recommend checking your credit for free at least once a year. Many credit card companies have programs to check your FICO Score for free, otherwise you can purchase the service for a few bucks when you run your credit report.