Buick Rendezvous Problem

The ABS light and the AWD light keep coming on. I’ve had it to the dealer three times and they can’t find the problem. Any suggestions on what to look for?

“Electrical problem: The ABS light, traction control light or the AWD disabled light may illuminate caused by excessive play in the front hub/bearing assemblies. (2002-03)”

From: http://consumerguideauto.howstuffworks.com/2002-to-2006-buick-rendezvous-6.htm