indcator fault.

hello there, has anyone had this problem before!!!!!
I got a astra sxi 04 plate 5 door. every time you lock the doors by remote the indcators should flash once, but tryed it tonight and find that only the right hand side flashs, So the left hand side is inop. All the doors lock and unlock ok. I really need some help fixing this fault. let me know asap
cheers

found the fault to be the indicator flash unit which is under the drivers side dash with the fusebox, its the big yellow box like a relay.