How do I activate the Diagnostic Test Mode on my Kenmore dryer?

The unit must be in standby mode (plugged in, display off) before activating diagnostics. Press the POWER button while simultaneously pressing MORE TIME and LESS TIME buttons together. Once in diagnostic mode, press the START/PAUSE button to advance through the diagnostic steps. (Page 22)

From the official Kenmore Dryer F01 manual, page 22

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