The freezer setting is all the way to 7 (coldest), and is in the teens to low 20s F. Fridge is set to 4 (middle), and is fine.
Opened the panel at the back of the freezer compartment, and no frost build-up.
Opened the back panel, vacuumed, cleaned, etc.
The compressor is running.
The fan in the freezer is running.
The air blowing out the back of the fridge isn't all that warm--that plus all the above lead me to believe that perhaps this is a low refrigerant issue?
Thanks!