I’ve never had an issue about the fan being loud, or the AC50s overheating. But I’ve seen a couple of vids on this subject and DIY vids on opening up the unit and replacing the cooling fan. All of them are from Germany or Italy. If you wanted to get a view on the inside of your unit, this one is pretty good.
(mein deutsch ist nicht so gut). I believe the guy is trying to replace the cooling fan. Obviously, wrenching on those potted wire connections may loosen them (and for sure void your warranty), but I’d thought this vid is interesting. At least to those that are inclined to repair/service their own units.