As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED DCA, ON CLIMBOUT, THE CREW HEARD A CRACKING NOISE COMING FROM THE CAPTAIN'S SIDE WINDSHIELD. LEVELED OFF AT 5000 FT AND THE NOISE WENT AWAY. CAPTAIN MADE AN INSPECTION OF WINDSHIELD AND FOUND LIKE WINDOW IS CRACKING. THE CAPTAIN DIVERTED TO BWI. MAINTENANCE INSPECTED WINDOW AND FOUND NO CRACKS. NO DEFECTS FOUND. CAPTAINS SIDE WINDOW REPLACED 4/22/07 AS A PRECAUTION.