Denon POA 6600A - one runs hotter

Dear Forum,

I know this is way too remote question to ask, but I found out that one of the blocks runs hotter, than the another however they sounds balanced to me.
I am using them with a Martin Logan CLSII pair.

Should I do the ,,biasing" as shown in the manual? Could this be that any of the 2SC2238B or 2SC3852's killed in action?

Thank you for your answer in advance!