What was found
CREW ADVISED FLIGHT DISPATCH VIA THE ACARS THAT THEY HAD DECLARED AN EMERGENCY WITH ATC DUE TO A CRACKED F/O SIDE WINDSHIELD. THE ACFT WAS AT FL300 OVERHEAD SSM. THEY DESCENDED TO 10,000 FT, 250 KTS, AND RETURNED TO DEPARTURE. NEW WINDSHIELD INSTALLED, LEAK CKD IAW E19-56-11-00-400-801-A SERVICEABLE.