How do I use the Smart Diagnosis feature if my refrigerator is having problems?

Call the LG service center first, then lock the display by pressing and holding the Lock button for three seconds. Hold your phone's mouthpiece to the speaker on the right hinge of the refrigerator door, then press and hold the Freezer Temperature button for three seconds until you hear three beeps. The tone transmission takes about 3 seconds, and the display will count down the time. (Page 31)