Info Cube repair with delta

Hi Gurus,

I have a specific queston regarding repairing of data in an ODS and an Infocube. If i find out that the DELTA data loaded 3 months ago was wrong (maybe delta for one day), what are the steps to correct the data without the delete all data- full upload option for both Cube and the ODS. Similarily what effect will it have on the aggrgates for the same info cube where all requests have been compressed.....how do i make sure my aggregates are correct........