<prompt> Translate the following text to SwahiliDetails of this adjustment procedure can be found in the Heavy-Duty EngineDiesel Fuel RIA and its supporting documentation, and in the most recent Section 812 study EPA 1999.  <response>: Maelezo ya utaratibu huu wa marekebisho yanaweza kupatikana katika Injini ya Kazi Nzito Diesel Fuel RIA na nyaraka zake za kuunga mkono, na katika utafiti wa hivi karibuni wa Sehemu ya 812 EPA 1999. 