Ashdown ABM sounds fuzzy??

I've always has great luck with Ashdown amps but recently picked up a "new/old stock" Ashdown Abm 900 Evo III. While the right (top) speaker outputs sound amazing, the left (bottom) Poweramp sounds like there is literally a fuzz pedal running parallel with the actual signal from both outputs. Anyone else have a similar issue or insight? The dealer basically told me they can't help.me, and to contact Ashdown who I am in some correspondence with. Not that I NEED both poweramps, but it's nice to know it is functioning as it should!

 

Here's a good look back of the amplifier overall, and then specifically the speaker output section with the two outputs that do not work circled, which are a separate power amp then the ones above them. Going to take your advice here in a few minutes and see if anything happens!

 

Ashdown suggests a a likely short in one of the left amp's capacitors or transistor. *Shrug*

 

But I'm hoping! And thank you for the thread link. I can have a schematic and hopefully it won't take long or cost too much. I appreciate all the help everyone

 

Thanks again everyone! The schematic and the points that Ashdown made for me work perfectly and it was fixed rapidly