What was found
ON FLIGHT 4300 (ON FIRST FLIGHT OF THE DAY) THE CREW REPORTED THAT AT 17000 FEET WHILE PERFORMING THE ANTI ICE TEST RECEIVED A BLEED 2 OVER TEMPERATURE WARNING. WHEN THE CREW PUT THE OVERRIDE KNOB BACK TO AUTO THE EICAS WARNING MESSAGE WAS GONE. THE CREW REPEATED ONE MORE TIME AND GOT THE WARNING MESSAGE. THE CAPTAIN ELECTED TO DIVERT TO CMH. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE E2 FAN AIR VALVE IAW AMM 36-11-03. ACCOMPLISHED E2 AIR BLEED SYSTEM OPERATIONAL TEST IAW AMM 36-00-00. THE OPERATIONAL TEST WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.