Now we almost prepared buffer part

Now we almost prepared buffer part 13 pcs. We think Buffer part will send in this weeks.
We want to ask you for the Serial Number on repaired part.
1. Where is the place that you write “Repaired Return”?
2. Nissan Vietnam , They know that we will repair and return part to them or not?
3. If They knew , Please you confirm Place to delivery as below true or not?

Attn. Mr.Hung Nguyen Manh
Company Name : NISSAN VIETNAM CO., LTD.
Address :3rd Floor, PVI Building, No. 168, Tran Thai Tong Street,
Yen Hoa Ward, Cau Giay District, Hanoi, Vietnam
Phone. +84 (4) 7301 1333; Ext:128
Fax. +84 (4) 7302 2333
Mobile. +84 904 888 388

4. Can we use as same as serial no. that Vietnam sent come back to us?

Thank you for your attention.