I've got a 7 G2 that has a wifi problem. The wifi option only comes up with "error" and there is no MAC address listed. I've flashed a couple of different ROMs into it and the fault remains. I'm thinking that it is a hardware issue, so where is the wifi chip / card, and is it replaceable? I've split the case for a quick look but stopped short of lifting the mainboard. I guess it's under there?