What was found
MID CABIN TEMP EICAS C THE MID CABIN SUPPLY DUCT TEMPERATURE IS MORE THAN 190 DEGREES F (88 DEGREES C); OR THE ZONE TEMPERATURE MID CABIN CHANNEL HAS A FAILURE OR THE SYSTEM IS OFF.REMOVED AND REPLACED THE MAIN CABIN ZONE TEMP CONTROLLER. ALL TEMPS NORMAL.CREW DIVERTED FROM ORD ON THE WAY TO LHR TO EWR WHEN THEY FOUND THEY COULD NOT CONTROL CABIN TEMP AND THE SECTIONS OF THE CABIN WHERE ALL DIFFERENT TEMPERATURES AND TOO UNCOMFORTABLE FOR AFFECTED PASSENGERS. SEE LOGPAGE 8957864