I found the language default setting defaults to Spanish. I can't change it. I tried to turn off the box but it doesn't work. Then there is no sound on some channels and I have to wait for the menu to restore since I turned off the box. Gonna have to call Comcast to fix the language thing.
Make sure you have Descriptive Video Serivce turned off as well. Having it turned on will lock your audio language to Spanish until you turn off DVS.