I had the same problem 2 months ago but I have a great dealership, so I took it over to them and walla! Rear shocks replaced under warranty. So I gave them a 5 star satisfaction rating, which is a big deal to them.
Last week I had front LCAs squeaks, I took it over to them again and they already know the TSB about it so parts were ready for anybody coming for that TSB.
I have a 2013 Mustang
GT also with little over 10K miles in odo .