Classe 70 power amp mods?

I read some old posts that mentioned a few mods to the Classe 70 amp, but were not specific. Anyone have the technical info on any mods that are worth the effort? Not sure right now when mine was mfg. but will find out.

Right, there was a thread where a guy was talking about sending the Classe 70 for upgrades, but he was not specific about it.