Client and Location change after H1B Visa Stampimg

Hi All,

I got my H1B petition approved in Apr 2015 for Client A & Location L. My Stamping was also done on Jun 2015.

Now the client is changed to Client B & Location is L1 (Employer being the same).

What are the necessary STEPS / PROCESS I need to take care of when I go for travel for a diff client other than the one approved in petition ?

Should my employer file an amendment for change of Client & Location which will take 3-4 months or only LCA will work?

Please guide me on this situation, I am very tensed on what & how things will go?

Appreciate your help on this !!