Trace Elliot AH1000 - Strange sound from right channel

[Astoroth]

[color=#282828][font=helvetica, arial, sans-serif]Hi,[/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]I have a Trace Elliot AH1000 head (2007+ Peavey) connected to 2 TE Cabs, 1x18 and 4x10. When I turn on the amp, the left channel is clean as a bell and sounds great, the right channel sounds like a car engine revving with or without an instrument plugged in.[/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]Swapping round the speakers simply changes which cab the noise comes from so it's not the cables or the cabs.[/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]Anyone got any ideas what it could be? If it's something simple I'm pretty savvy so may be able to fix it myself however[/font][/color][color=#282828][font=helvetica, arial, sans-serif] any suggestion on where to get it fixed in the Oxfordshire area would be appreciated too![/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]All the best,[/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]Rich [/font][/color]