As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LEVELLING OFF AT 20000 FT, THE RT PILOTS WINDSCREEN CRACKED. A/C BEGAN A DESCENT TO 5500 FT AND RETURNED TO BASE UNPRESSURIZED WITH NO FURTHER INCIDENT. WINDSHIELD HEAT WAS IN USE WITH NO OVERHEAT CAPTIONS.A NEW WINDSCREEN WAS INSTALLED WITH NO ABNORMALITIES IN ITS REMOVED AND REPLACED. (TC NR 20070730003)