Dear Sameer,
Since, you are willing to re-import the job worked goods into India, therefore, as per my knowledge and experience in FEMA & Customs matters, your A.D. (Authorized Dealer i.e. your Banker) can't refuse to issue a GR Waiver (EDF Waiver). Even if they still refuse, then you may either submit a certificate from your Export Promotion Council or a CA Certificate along with Three copies of Invoice & Packing list, Details of Job Work which is required to be done on the subject goods to the AD to Get the GR Waiver (EDF Waiver).
After getting it you need to mention the GR Waiver reference number (EDF Waiver) on the S/B. After getting the subject goods duly job worked, you need to pay customs duty on the additional amount charged by your USA Based Job Worker. The copy of the B/E along with Job Work Charges Invoice, Copy of the S/B must be submitted with your AD to close this transaction. Also remember to close the EDPMS and IDPMS related to this transaction.
Regards,
Yagay & Sun