Renovation of the seven public tennis courts at Andover High School is underway. As a result, the courts are closed until the end of September while workers resurface them, improve drainage, and apply a triple layer of acrylic paint. The new surface is expected to last “another couple of decades,” according to Brian Frykenberg, coordinator for the Friends of Andover Tennis, a volunteer group that is helping the town with the project. The nonprofit group donated $40,000 for the work; the town will be paying the balance. Town Meeting in May approved setting aside up to $400,000 to renovate the courts, which are more than 20 years old and showing their age, with dangerous cracks and a surface that is pitched and worn. About 1,200 people of all ages and skill levels use the seven tennis courts at the high school each year, including Andover’s high school tennis teams, which are top-ranked in the Merrimack Valley. The Friends of Andover Tennis is seeking donations to help with the maintenance and upkeep of the courts once the renovation work is completed. Tax-deductible contributions may be made payable to “Friends of Andover Tennis Fund/ECCF” and mailed to Friends of Andover Tennis Fund, 175 Andover St., Suite 101, Danvers, MA 01923. New members are welcome. For more information, visit www.friendsofandovertennis.org.