Here is how to run a service mode to test a KitchenAid refrigerator if it's not cooling or doesn't work properly. The video includes diagnostic mode codes with a description.

KitchenAid and Whirpool Diagnostic Mode and Codes - KRFC704FBS00
The instruction also works for the refrigerator models:
WRF954CIHM WRF954CIHB WRF954CIHW WRF954CIHV WRF954CIHZ WRF964CIHV WRF964CIHZ WRF974CIHV WRF974CIHZ WRF984CIHZ WRF984CIHV WRFA94CIHN WRFA94CIHZ KRFC804GSS KRFC804GPS KRFC804GBS WRF972SIHV WRF972SIHZ JFFCC72EFP JFFCC72EFS KRFC604FSS KRFC704FBS KRFC704FPS KRFC704FSS