09 G37 Sedan 7 Speed Automatic Journey Model with 3000 Miles

I had scheduled an appointment today at Infiniti service department due to the same problems a lot of people on here seem to be experiencing.
Seemed like the RPM was flaring and shifting awkward as well as that popping feel when it's searching for the gear.

I took a copy of the TSB to them to show, on the TSB it says for G37 Sport Sedan and mine's not a sport Sedan, so maybe that's the reason they said what the said below.
Here's the link another member posted of a picture of the TSB.
http://www.imagedump.com/index.cgi?pick=get&tp=550499

Anyways a couple of hours later I get a call that they are going to have to keep my vehicle over night.
They said whenever they took the car to the back, the engine service light was on, and now they have to replace the ECU, Engine Computer. (The engine light had not been on any time prior).

Also the service guy stated, and I quote, "We had a technician check out the TSB and there was no update to your TCM, transmission control Module, it either did not need it or yours had the most update software in it."
Well I know I don't have the most recent update since I purchased car in early May and the TSB didn't come out till June 26th.

Just wondering what peoples thoughts are on this? I'm worried as I'm sure everyone is that this is going to be an on going problem.
I'm supposed to have the car back tomorrow, so we'll see.