The updates were done to solve the problem of cracks in the stock.To determine if they have been done,you can look for two things.The first is a dot (.) between the O and U in the serial number.The foolproof way is to look at the bottom of the breechface for two holes that have been drilled and plugged with allen head screws.
These updates were once done for free by Remington but not any longer.Laibs Gunsmithing(USA) is the preferred place to get it done now,however,the cost for a Canadian to have it done(shipping,exchange,GST and the likes) will prove to be pretty excessive now.
Dave