Friends,
As the defaults has been generated by Income Tax Department for the Financial Year 2012-13 regarding late submission of TDS returns or late payments of TDS/TCS etc. There is no detail of defaults in Notice issued by department. It has also mentioned in notice that detail of defaults are available at www.tdscpc.gov.in. Complete path of detailed default along with screen shoot of the "view default summary " is given below :-
Path at tdscpc.gov.in = Login > Defaults > View Default Summary > F.Y. > Quarter and press go button.
Now, on pressing quarter next screen will require detail of one challan and three unique Pan Numbers along with TDS amount. After that default file will be available under download link.