Left Channel Out Primaluna Dialogue Premium

Hey folks.  So I turned on the stereo last night ready to listen to some tunes when it was clear there was no volume at all coming from the left speaker.  Right channel sounds just fine.  I did some speaker/cable/source switching and swapping and determined it was the integrated amp.  It’s a Primaluna Dialogue Premium which is the predecessor to the EVO 300.

I swapped out all the tubes, still nothing.  Did some research and stumbled on some info regarding the fuse.  I can replace that today but if it was the main fuse, wouldn't both channels be out?  
 

I came across a similar thread on here from @whacky who mentioned a left and right channel fuse.

”There are separate fuses for the right and left channel. Not just the main fuse. they are contained on inside a small fuse holder on the left and right side after you open up the underneath.”

Problem is, I can’t seem to locate an internal left or right fuse.  Nor can I locate any kind of PL schematic that shows where this fuse might be.  I have a message into Upscale and maybe they can point me in the right direction but I thought I would reach out to all the fine folks here for some assistance. 
 

Any other thoughts as to what the problem might be?  If it is a left channel fuse, where is that guy located?  Thanks for your help!