We have a 7 year old Kenmore 24" dishwasher (purchased from Sears). I run it daily. Last night it started make a VERY loud noise during the cycle. It seems the noise was coming from the bottom left area of the dishwasher. Although the cycle(s) run fine and it' s not leaking, the noise was extremely loud like the motor was working double time. Could there be a reason for this?