Based on my research, I’m pretty certain I blew out the left internal amp. I think you’re right regarding the ohms mismatch issue. I had no idea that speakers could blow out a receiver. I always thought it was the other way around. I paid the price for my ignorance. I looked for internal fuses, but there were none. I was hoping it was just a blown fuse, but that’s not the case.
Thanks again for the help!