As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L WINDOW HEAT FAIL AMBER CAS ILLUMINATED IN CRUISE FLIGHT AT FL450. COMPLETED QRH CHECKLIST ISOLATING THE L WINDOW HEAT CHANNEL BY PULLING CB F11. SMALL CRACK BETWEEN PANES APPEARS FROM FAULT POINT NEAR WINDOW FRAME REMOVED DEFECTIVE COCKPIT LH SIDE WINDOW AND INSTALLED NEW SIDEWINDOW IAW MM 56-10-05 OPS AND LEAK TEST GOOD.