There is no open service letters that are valid for you unit. There are two minor expired, and who completed. I am not reading an hour value on your DPF for servicing, but the general rule of thumb is between 5000-7500 hours it needs to be cleaned. It will be you having a local cat service tech coming out to do a forced regen for removal, removing it and having it cleaned at a highway truck shop, then installed again. After install your service tech will need to update the software. It may have been done already, but i do have access to the records. Other than that it is basic maintenance intervals and your Operators Manual will have all of that. If you do not have one, you will want to order one.
Cheers.