A Columbus City Schools administrator is expected to plead guilty today to charges of changing student grades. State auditors found Stanley Pyle changed more than 600 grades from failing to passing and erased 9 thousand student absences while assistant principal at Marion-Franklin High School. That was uncovered as the auditor's office investigated the district's attendance data fixing scandal. Sentencing for former district data chief Steve Tankovich for his role in that scandal was postponed yesterday. Some school board members and former superintendent Gene Harris may also face charges once the probe is compete.