Whirlpool Dryer Shuts Off When Start Button Is Released

Dryer Repair
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Hi, I Have A Whirlpool Dryer Model Number Gew9878lwo It Works Fine As Long As You Hold Down The Start Button But When You Release It It Stops. While You Hold Down The Start Switch It Has Heat. I Have Been Using A C Clamp To Hold The Button Down But Would Like To Fix This Properly. Can You Narrow This Problem Down To Which Part Is Faulty With A Multimeter? If So Can Antone Tell Me The Procedure? Thanks In Advance For Any Information That You Can Provide Me.