I have a Solid State Yamaha G50-112 II guitar amp that started making a "Whooshing" noise that gets louder as the volume goes up. It does this on both channels. I pulled the chassis out of the cab. Cleaned the pots and jacks. Looked for obvious burnt components, but everything appeared normal. Cleaned all the jacks. Looked for loose wires and connections, they seem fine. Searched for broken, cracked and cold solder joints, to no avail. Did the wooden chopstick "poke-around" and nothing changed. Has anyone experienced this and possibly know where/what the culprit might be, without me throwing parts at it indiscriminately? Thanks.