As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT LEFT SIDE WWINDOW HEAT OVERHEAT LIGHT ILLUMINATED. ACCOMPLISHED QRH & LIGHT REMAINED EXTINGUISHED. GROUNDED - YES. ACCOMPLISHED WINDOW HEAT SYSTEM OPERATIONAL TEST, OPS NML REF B737-900 AMM 30-41-00-710-801. DUE TO HISTORY SUGGEST SIDE WINDOW CHANGE. TWO WINDOW HEAT CONTROL UNIT BEEN REPLACED AND SPARE SENSOR WAS READING BAD. REMOVED AND INSTALLED L/H SLIDING WINDOW ASSY REF AMM 56-12-11. LEAK AND OPS CHECK GOOD.