You have active cooling on yours? Nice. I'm not concerned about the temps - still well below the limits. I likely would not have even noticed had it not been mentioned by others.FWIW my AC86U has not experienced a significant bump in temp.
I have an audiable notification set up in HA when the temp hits 77C, and it has - but it doesn't seem to be a long term thing that the fan cannot easily mitigate.
Dunno if this helps, but I am happy to provide any relevant historical data.