Mercedees DOC codes

I have a 2008 sterling with the mbe4000 engine. I pulled 4 active codes out of it today with our snap-on prolink the codes are as follows:
1.DOC outlet temperature- signal spike spn 3072 fmi 10 sid 322
2. abnormal DOC temperature rise spn 3072 fmi 14 pid 322
3. DOC outlet temperature high spn 3072 pid 322 fmi 16
4. DOC outlet temperature high spn 3072 sid 322 fmi 0

I am wondering if any one has seen these codes and what could be the cause. I have not done any diagnosis yet that will be tomorrows task. I should be able to view doc temps and dpf pressures with the prolink. Any info or diagnosis tips is appreciated. I have a rear doc outlet sensor ordered as it is fairly cheap but right now its just a hunch.

 

Just an update changing the rear doc temp sensor corrected the issue. Just checked after truck has been used the last few days and no codes have reappeared.