2010 cascadia dd15 active faults problem

We just traded in our old 2003 century for this 2010 Freightliner cascadia with dd15 engine and have 2 active faults that cannot be cleared. Here are the codes:

sam controller
sht lo 249s254 04

sam sa33 spn520908 04

i would appreciate anyone's input as to if these mean that something serious is wrong. We just had a pm done to the tune of $500 and I really can't afford to take it to a Freightliner dealer at this time. Of course we will take it if something is seriously wrong but just trying to find out some info.
thank you

 

Thank you for the reply, there is a bulb out on the drivers side courtesy light but haven't been able to figure out how to get the cover off to replace it. Would anyone know how to get the cover off or is there another way to replace the bulb? Thank you

 

Thanks Chip, we will check the fuses when we get a chance. The drivers side mirror heat isn't working as we found this out a day ago. And thanks for the info on replacing the lite bulb. I really appreciate the help!

 

Chip, you were so right! Fuse # F27 wasn't even there! Put fuse in and mirror works and faults were deleted! Thanks again so much for the help!