What was found
EN ROUTE FROM CLT TO IAH, THE CAPTAIN'S NR 1 WINDOW BEGAN ARCING AND THEN SHATTERED AT FL340. CREW DECLARED AN EMERGENCY AND DIVERTED TO THE NEAREST SUITABLE AIRPORT AT BHM. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE CAPTAIN'S NR 1 WINDOW PER AMM 56-11-11-401. ALSO, REMOVED AND REPLACED CAPTAIN'S NR 1 WINDOW HEAT CONTROL UNIT. REMOVED MODE CONTROL PANEL FOR WINDOW REPLACEMENT. RE-INSTALLED MODE CONTROL PANEL AND PERFORMED SATISFACTORY OPS CHECK PER AMM 22-11-34-745-001. OPS CHECK NORMAL.