Buzzing coming from control panel

My 20 year old Whirlpool CleanTop range is presenting a buzzing noise that seems to be coming from around the control panel. The oven/stove does not need to be in use for the buzzing to occur. All the timers and controls work, and you can actually feel a vibration on the timers. Does anyone know what this is?[LEFT][COLOR=#000000]
Read more: http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/512665-whirlpool-oven-buzzing.html#ixzz3qvjNvrMj
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Here are your parts. It is for a YQ1 unit.
Parts for Whirlpool RF365PXYQ1 Range - AppliancePartsPros.com

See the attachment for the wiring diagram.

Could be that the timer motor is on it’s last legs.

You will have to open it up to find the source of the buzz for sure.
May be just a part the has loosened up.