Left channel sounds louder

I am not an expert, but some volume controls will be stepped from left to right. Have you tried manually adjusting the volume in small increments rather than using a remote?

I have had that due to three things. 1) one channel was recorded or mixed louder, happened once on a poorly mixed re-issue LP. 2) The rectifier tube on my phono stage was going out and it resulted in a marked decrease in right channel volume, this occured only on LP's, normal sound on CD's. 3) most common problem, poor speaker placement, all the measurement were equal but my room and it's contents were not. I played a few mono recordings until the sound was centered and the soundstage was proper.

Now, that being said I am sure there are problems with upstream components that could cause this as well. My suggestion if the top doesn't help eliminate electronics upstream to down until you find the culprit.

I had an experience like that with a CJ 16LS. I bought it used and at first the volume was fine...until I cranked it up past 42 on the stepped volume control. After a series of cable/component switching experiments, I confirmed it was indeed the pre and not something else. I called the guys at Conrad Johnson and then sent it in. $300 and some dollars later they replaced some volume attenuation parts and it's been happy trails ever since.

I had a similar experience with my Krell HTS 7.1. In the end the problem was created by me! When programming the processor I had inadvertantly set the "speaker distance" on the right channel to about 35' and the other one to about 3'. Naturally the right channel was much louder. Once the programming was adjusted, all was well.