I can 'One Up Ya' on this... I took my 2013 JKU in for the recall on the Transmission Oil Cooler/Power Steering issue and without asking me, they went ahead and performed the ECU update. I have yet to even receive a notice on this from Chrysler. Anywho, they just ran the update - did I mention I have an AEV Procal.?. If ya saw a jeep with 38 inch tires and a 5 inch lift one would think, Hmmm I bet their speedometer has been programmed accordingly, ya would think. I had to reprogram some things they overrode. Kinda pissed me off. And they did a crappy job on the Power Steering tube recall. This was at Patt Lobb Jeep in Frisco, Tx. The codes for the ECU warranty work are as follows: (from my receipt)
Perform RRT 12-052 Completed RRT. Reconfigure Message Center LOP 1889019B
Perfrom RRT 12-066 Reprogram WCM. LOP 18802891
Also, when I questioned exactly 'what' the ECU was changing my tech said the same, didn't know specifics but it came down from Chrysler. Hope this helps.