DALLAS (Standard&Poor's) Dec. 13, 2012--Standard&Poor's Ratings Services has corrected its long-term rating on Johnson County Unified School District No. 231 (Gardner-Edgerton), Kan.'s series 1994A, series 2001A and series 2006A general obligation (GO) bonds to 'AA-' from 'A+'. The outlook is stable. These bonds are guaranteed by bond insurance policies from Assured Guaranty Municipal Corp. (AA-/Stable).