What was found
AT LEVEL OFF AT FL 410, "WINDSHIELD HEAT INOP L" CAS MESSAGE CAME ON. CHECKLIST COMPLETED FOR THAT AND SOON AFTER LT WINDSHIELD CRACKED. PERFORMED TEST OF WINDSHIELD CONTROLLER. OPS CHK GOOD. REMOVED CRACKED WINDOW. INSPECTED CONNECTIONS & WIRING TO WINDOW. NO DEFECTS NOTED. CLEANED & PREPPED WINDOW FRAME. INSTALLED REPLACEMENT WINDOW, PERFORMED. LEAK CHK. LEAK CHK GOOD. OPS CHK GOOD. WORK DONE IAW MM 56-11-00 (REV 14).