As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ELEVATION OF 28,000 FT. AIRCRAFT HAD DEPARTED, PILOTS REPORTED THAT THE WINDSHIELD HEAT WAS ON, WHEN THE RT WINDSHIELD SUDDENLY CRACKED. AIRCRAFT PRESSURE WAS NOT AFFECTED. FLIGHT CREW DECIDED TO RETURN AND AN UNEVENTFUL LANDING WAS MADE.