The 2014 version is just four screws. I have no reason to believe that the mechanical design has changed. It has the same number of smoke units, but their functions have changed. This version doesn't have the alternating stack chuffs, but it has the pop-off steam feature. In the 2014 version, all the smoke units are on the chassis.
Once you have the top off, there are a few 1.5mm connectors that you have to be careful unplugging as they are easy to pull the wires out instead of the connector. I bought these Pennington forceps specifically for making it easier to grip that type of connectors and remove them.
On my 2014, I had to pop the top to fix the cab light, that was it's only flaw, and I wasn't about to ship it for that!