As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 430 AND 45 MINUTES INTO THE FLIGHT THE LEFT WINDSHIELD OUTER ANTI ICE GLASS PANE CRACKED. USED THE QRH TO ASSES THE SITUATION. RETURNING TO BASE WAS DECIDED THE BEST ACTION. NO SAFETY ISSUES AROSE AND SAFELY LANDED BACK AT DEPARTURE AN HOUR AND THIRTY SEVEN MINUTES AFTER TAKE OFF