As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT EXPERIENCED A CRACKED OUTER WINDSHIELD ON THE CAPT SIDE AT FL390. FLT DESCENDED TO FL220 PER THE FLIGHT MANUAL. *S/D* WATER INGRESS THROUGH THE WEATHER SEAL REACHED THE WINDSHIELD''S BUSBAR, RESULTING IN ELECTRICAL ARCING AND SUBSEQUENT CRACKING OF THE WINDSHIELD OUTER FACE PLY. CRACKING OF THE OUTER FACE PLY DOES NOT AFFECT STRUCTURAL INTEGRITY, HOWEVER THE WINDSHIELD WAS REPLACED PRIOR TO THE AIRCRAFT''S NEXT FLIGHT.