Roland JC40 fizz when playing

[brett123]

I just bought a Roland Jazz Chorus JC40 a week ago. It's just now begun to start producing a very high pitched fizz sound only when notes are played. The sound is audible with volume past 1 and very audible with the bright switch engaged. I've filed a warranty claim with Roland, waiting for their response. Any idea what this could be? I plugged into both speakers separately since this is a stereo amp and it's present from both speakers when isolated.

[J M Fahey]

If itīs a new product with a valid warranty, just send it back, period.
Do not even open it.