[TenTec] Popping in O1 audio during AF adjust

[art davis]

My O1 (2.0.6.2a) has recently developed a popping in the left audio channel of the headphone output when adjusting the volume of either the MAIN or SUB AF. The rate of the popping seems to be in sync with the rotation of the AF controls (optical encoder?) and its volume goes up and down with the audio volume. In the headphones it sounds just like you ears popping during flying or diving under water. The popping is not affected by the mode, RF gain, sidetone volume, MON setting, or any other front panel control setting, except as described for the AF controls. 
Any ideas?
 		 	   		  
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