Strange amp channel behavior

I posted in another thread but it's concerning a different issue and didn't get a response so I'll give it a go here. I have a pretty clean Onkyo TX-8211 receiver. There are 4 speaker outputs, A + B - L & R. BL doesn't output any signal to the speaker upon powering on the receiver until the volume is turned up to around 2/3 to 1/2 volume, which is quite loud. Get me into trouble with the building manager loud. Once it kicks on though, it will remain working, even at low volume for as long as I keep the unit powered on, even if the music stops and starts again. Once I shut the power to the receiver off though, it's right back to not working. I removed the main board from the chassis and looked it over thoroughly with a loupe because there were traces of what looked to be solder and possibly very fine silver wire which initially made me think that a jumper or other component had violently exploded but after examining the board for a solid half hour, top and bottom, close up I couldn't find even the smallest evidence of anything out of place and I would think that any kind of damage that would produce little shards of metal would be at least somehow visible somewhere on the board so I've ruled that out for the most part. There's no burn marks or any discoloration anywhere nor any solder points that look abnormal, pieces of any components or stubs left where any component would have been. It's actually a pretty nice looking board for it's age. So in reading several things on it all points kind of lead to a speaker protection relay of which there are only 2 on this amp. They are both DG2SU DEC relays. Looking for some input on this issue please...
 
That's not really a "wall of text". It's more like a paragraph. Or are they breaking books down into sentences nowadays for those who can't comprehend anything longer?

Thank you kapitiaudio. Do you recommend going with a better relay? Or are the direct replacements sufficient?
 
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