On Wed, 10 Aug 2016 08:36:23 -0700 (PDT), Frank Thompson
wrote:

On Wednesday, August 10, 2016 at 10:24:51 AM UTC-4, bob_villa wrote:
On Wednesday, August 10, 2016 at 8:54:04 AM UTC-5, Frank Thompson wrote:
Side by side Whirlpool refrigerator is cooling only to 58 degrees when set to lowest setting. Serviceman replaced diffuser, but that did not remedy the problem. Freezer side is working fine. Any suggestions appreciated.

Is the fan working in the freezer (to divert cold air to the lower section)?

yes
Has it been defrosted recently? the tube between the freezer and
fridge is bad for being blocked with ice