As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DCA - FLT 545 - DURING CLIMB-OUT, THE FIRST OFFICER'S WINDSHIELD HAD AN ELECTRICAL ARCING WHICH IMMEDIATELY CAUSED APPROXIMATELY TWENTY CRACKS IN THE OUTSIDE WINDOW. THE CAPTAIN DECLARED AN EMERGENCY AND RETURNED TO DCA. MAINTENANCE REPLACED THE WINDSHIELD. AN OPERATIONAL CHECK OF THE WINDSHIELD ANTI-ICING AND ANTI-FOGGING SYSTEMS WERE CHECKED. OPERATIONS CHECKED GOOD. (W)