As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT T2242/06SEP - RIGHT FORWARD WINDOW HEAT FAILED. TURNED OFF POWER TO WINDOW HEAT AND SECONDS LATER FIRST OFFICERS WINDOW DEVELOPED LARGE CRACK. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. REPLACED FIRST OFFICERS NUMBER ONE WINDOW. SYSTEM GROUND CHECKED NORMAL OPERATION.