For a small area of 12 to 24 bricks, replacement by a professional can cost $250 to $350 for labor, in addition to the cost of the bricks themselves. However, if the area is larger than that, the cost of replacement will be larger as well.Brick prices vary based on the type and the quantity needed.
Medical bills and paid collection accounts (credit card charge offs etc) remain on your reports for 7 years. The reporting period for medical starts on the day of service. The reporting period for the collection accounts start when the account first became 30 days late and was never brought current leading to the charge off. You might check out the link I've provided. It is a free do it yourself credit repair forum.
In other words, if you have an unpaid collection account  from Jan. 2000 and you decide to pay it in Apr. 2004, it will  remain on your credit report for 7 years from the date you paid  (Apr. 2004) instead of the original date it was reported (Jan.  2000).