Yes, I found the info. Thank you. A few days ago, I talked an agent in pasc. She asked me to pay $225 + shipping for polishing case. Plus, it will take around 3~4 months and maybe longer.
As I am not that patient guy, I decided to polish it by using a Flitz metal polish paste. 2 Dents and deep scratches are not showing in the picture, but they are still there. However, I felt so satisfied because It does look so clean..
I will do the major polish thingy in 5~6 years when it's the time to overhaul 312.