ABS And Trac Off Lights on

1997 Chrysler LHS 3.5L 115,000 Miles ABS and Traction Control

Recenlty my ABS and Traction Off light have come on, I know this is on wiith same fuse as Climate Control and that and everything else is working.
The last repair on the car was lower ball joints on both sides. What might some possible causes that I can look for.

thank You