SSRS report powershell script

I have SSRS 2008R2 reporting having 3 data sources.Say reportname = \Marketing\Test.rdlDataSource name = \Shared DataSources\Data1 , 2 ,3Now when deploy the report using reports manager upload functionality , after deployment it looses all three connection reference.is there any powershell script to set again correct datasource for this 1 report.