hard to say for sure, but U109 and U208 could be UART into those Cisco baseband or radio chips. one placement for the 2.4 GHz (G) and 5 GHz (A), respectively. would be interesting to probe around there and see if you get a serial interface to it… obviously for extra credit ;-)
https://www.youtube.com/watch?v=Fow7iUaKrq4
edit: also 17 FUCKING years ago… GD!