What was found
LEFT SIDE WINDOW HEAT OVERHEAT, TURNED OFF, BACK ON AFTER 5 MIN, NORMAL OPS. CAME BACK ON DURING TAXI IN. GROUNDED - YES. REMOVED AND REPLACED THE L-2 OPENABLE WINDOW PER B737-900 AMM 56-12-11-400-801. LEAK AND OPS CHECK GOOD. CLEARS MEL 30-11E. PLACARD REMOVED. SEAMC NOTIFIED,