As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THROUGH FL 300 THE L-2 WINDOW OVERHEAT AMBER LIGHT CAME ON. RAN THE QRH PAGE 3.6 CHECKLIST AFTER THE 2-5 MIN WAIT THE OVERHEAT LIGHT CAME BACK ON. GROUNDED - YES. PERFORMED BITE TEST ON LEFT SIDE (L-2) WHCU, BITE TEST GOOD. PER B737-800 FIM 30-41 TASK 801 THIS CLEARS MEL 30-11E SEAMC YARED NOTIFIED PLACARD REMOVED. NO HISTORY PAST 30 DAYS.