The chassis checks appear to be different from and unrelated to the cracking of the upper chassis rails at the upper wishbone rear mounting brackets that led to the bolt-on brace a couple of years ago for pre-2014 chassis or indeed, new chassis for those of us that have experienced the cracking of the 2012 and 2013 chassis.
Got it. My car is from 2014 so I thought I was safe regarding the chassis problems but this "recall" is for all cars up to (and including) December 2014, so my car is within the time frame concerned.
I have no idea what (and where) I should be looking for. Called the dealer, he doesn't know either but he told me he was going to ask the factory for more details