ECC6.0SR1 to SR2 or SR3

Dear All,

Environment:

SAP :  ECC6.0 SR1

OS   : win2003

Oracle : 10g

I upgraded from 4.7 to ECC6.0 SR1.But client is asking now SR2 or SR3.Intially they are not provided SR2 or SR3 CDs.Now the project is in UAT Phase.

Whats the procedure to make SR1 system to SR2 or SR3.

Please anybody help me in the loop

Thanks&Regards

RAmakrishna