KGReddy,
I dont think you have to seperately notify. But in anycase, just go ahead and respond to your RFE before its too late.
If you have already filed for your EAD/AP renewal etc. you will see that everytime you do that, for every single application, there will be a G28, so I presume that unless you specifically add a G28, you can represent yourself. If that holds true, you can respond to your RFE by yourself.