I dispute innocuous data anomalies, like names and addresses in error.
Generally speaking, there are no magic letters here or on other forums. For disputing things like this, it can be done online. Or call 'em. For these issues, the bureaus will usually act quickly. Doesn't involve a lotta work, and it cannot be used to screw over the consumer, so they fix it.
For address corrections, especially if they have your current address wrong, you'll need to send 'em a photocopy of your Driver's License showing your current address.