This is probably what the Aviation Consumer's article is talking about. It's not a "factory recall" as such. It is pretty serious, but the modifications/repairs were not done at the factory, it is not, in fact, a complete re-manufacture and modification, nor does it affect the entire 1973 production run.
https://ww2.txtav.com/TechnicalPubli...Number=ME73-12
Yellow journalism comes to mind. AC will not be my reference of choice for making any aircraft purchase decisions.