It appears that the small 8-pin part just to the right of the pink box (TI20 MI60) is the magnetomoter. I wish I could tell what kind it was.
Actually, nevermind, it appears to be the same chip as step 14 and also appears to be in the same location as the microphone. Thus, it appears it is the second microphone. I wish they would mark it as such...
Any ideas what the part U23 is? That *seems* to be around the area of the magnetic sensor.