Will King

YTA22v46 automatic transmission on Husqvarna mower purchased from Lowes makes a noise anytime the transmission is engaged.  This includes sitting at idle not moving or full bore mowing.  It appears the belt that engages the transmission is engaged at any time the parking brake is off.  When the parking brake is on the noise quits.  Sounds almost like something that wasn't greased or something rubbing that isn't supposed to.  Not familiar with this new transmission type.  Noise started from the very beginning before the first mow. Have mowed one time and the mower operated fine except for this noise.  Any ideas?  Take it back?