As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT TO DESTINATION, THE CREW OBSERVED ARCING ON THE F/O SIDE WINDSCREEN & THEN IT SHATTERED. THE WINDSCREEN WAS REPLACED, TESTED AND THE ACFT RETURNED INTO SERVICE. VISUAL INSP OF THE WINDSCREEN INDICATES THAT SECTIONS OF THE MOISTURE SEAL ARE ERODED WHICH CAUSED MOISTURE INGRESS AND DEGRADATION OF THE INTERLAYER THAT EVENTUALLY CAUSED AN ELECTRICAL ARCING AND FRACTURE OF THE OUTER LAYER.