What was found
AIRCRAFT WAS GROUNDED: FLIGHT DIVERTED TO SNN ON ACCOUNT OF WINDSHIELD CRACK ON CAPTAIN SIDE. EMERGENCY WAS DECLARED. PILOT REPORTS CAPTAINS WINDSCREEN HEAT ARCED IN FLIGHT, FOLLOWED BY SHATTERING OF SAME WINDSCREEN. MAINTENANCE REMOVED AND REPLACED L WINDOW HEAT CONTROL UNIT IAW AMM 30-41-01. WINDOW HEAT OPS CHECK OK IAW AMM 30-41-00 710-801. REMOVED AND REPLACED CAPTAINS L-1 WINDOW IAW AMM 05-11-01. ALL REQUIRED CHECKS NORMAL.