What was found
FLT 708 - TOL-BNA - DURING CLIMB-OUT AT 25,000, THE L-2 WINDOW ARCED. SELECTED THE L-2 WINDOW HEAT TO OFF AND IN APPROX ONE MINUTE MULTIPLE CRACKS IN THE OUTER PANE DEVELOPED. ALL KHA ABNORMAL AND SUPPLEMENTAL CHECKLISTS WERE COMPLIED WITH. THE AIRCRAFT CONTINUED TO BNA AND LANDED SAFELY WITHOUT ANY FURTHER DIFFICULTIES. REMOVED AND REPLACED THE L-2 WINDOW IAW BOEING MM. OPERATIONALLY CHECKS NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)