Hi ra,ra
Thanks for replying. After taking the 535 out and replacing it with a 636 that I use as on normal basis,I did swap the channels and the problem stayed with the left speaker and did not move with the channel swap. I also hooked up another set of speakers and both worked fine.
I do really enjoy the sounds from my 636. The 535 was just brought home from being repaired and hooked up when the popping issue came up.