abs / brake lights

Hi,
Last month I've changed my front R bearing on my 98' intrigue last month. It was a good operation since it was very noisy. The mechanic got some problem re-connecting the abs system since several solutions were possible (he told me). The low trac/abs/service would go on after they changed the bearing, they fixed it.
Now I had the abs and brakes lights. The brakes look ok (no vibrating ...), I don't know if the problem is connected with the last service (bearing / abs sensor) ? Where does the problem could come from ?

Thanks for your help, :)