As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL INFLIGHT T1252/16NOV - OVERHEAD INDICATION FOR LEFT FRONT WINDOW ILLUMINATED FOLLOWED BY MULTIPLE CRACKS IN LEFT FRONT WINDOW. LANDED STL WITHOUT INCIDENT. REPLACED WINDOW AND WINDOW HEAT CONTROLLER. SYSTEM GROUND CHECKED NORMAL OPERATION.