The other thing to check is the interconnect between your 282 and AV amp. It happened to me twice. The first was a relay issue when my 552 was almost brand new so it was sorted under warranty. The second was the interconnect.
The interconnect is brand new. I have tried swapping the rca ends the other way around on the av amp ie left cable in the right socket etc and the effect is the same. Just sound out of the left speaker. Which to me sounds like the right channel relay isnt working in the amp.
Too late now but i’ll try it again in the morning but with the av bypass switched off.
Then i’ll try the same cable but from the rca out on my cd player to the cd input on the 282.