Kenmore fridge

[fyramil]

Fridge is warm. Something is running. Not too familiar with parts. In back, below, removed 'cardboard' grill. Cleaned coils. Fan is running there. Freezer has some frost. Fridge is about 60 degrees. Where should I start? From reading the repair section from ACME I have a suspicion it could be the defrost timer? What do you think? Thanks.
Fridge is only 2 1/2 years old. As I said, something is running, but doesn't sound as loud as usual.
Also, freezer sounds like it's running, but inside refrigerator part it seems quiet; some water dripping near back, behind console.

[woodchuck]

With some frost in the freezer, the coils in the freezer are probably iced over preventing proper circulation of cold air in the freezer and to the fridge. You can take the inside back panel in the freezer to view the coils but I would turn the defrost timer and see if it defrost.