Help : 7at transmission leak !!

ZeN

Gents,

Last Thursday i went to local Nissan dealer to have my Engine oil and Transmission oil change. That same evening i saw white smoke coming out from the back of the car while coming home, my first thought was the flex pipe are done since it scrape so much so i sent the car to an exhaust shop to have a custom test pipe + y pipe + 2 x 12'' resonator straight through. The car finally howl like a GTR but too much on the loud side. While coming home after having a good run i saw the same white smoke again, WTF !!. Next morning on Saturday i sent it back to the exhaust shop, once i put it on the lift to check for leak - none but i saw a big splash of transmission oil residue on the Driver side (RHD). I quickly check both the drain plug and overfill plug and it was not leaking, when i trace the splash only the right driver side (RHD) that being splash all the way up to the wire connector that connect to the housing + the 2 cooler line area. Passenger left side is clean spotless. I wipe everything clean, called up my dealer and told them something on the transmission is leaking and set for an appointment this morning. On the way back it started to smoke when i reach my house after a good run, i also feel hesitation on acceleration on 3rd gear and it does not respond to my throttle. Downshift and Upshift has no lag and seems normal. No codes being throw out, i was expecting SES light to come out after the test pipe installation.

This morning i sent it to the dealer, junior tech works on Sunday. He have a look on the transmission and he says yes it leaks and says that it is from filling too much but he couldnt identify where the leaks come from. He told me to give it some time and it will stop eventually after the fluid drop to where it should be. I said f*** this junior tech, i ask him to call the senior mechanic for tomorrow appointment and drove my car home. On the way home i still see the smoke but after quite some time, believe it is heat related.

Question before i get to the dealer tomorrow :

1. Will the ECU put a safe mode if it sense the transmission get too hot ?
2. Is there any area where the transmission oil could come out if its been overfill after both the drain hole and overfill hole plugged properly. I saw right below the 2 cooler lines there's a screw and it looks like a hole pointing up next to the screw but i don't know what it is.
3. Will it be better if i just open up that overflow plug, let it drain from there, put it back together and drive normally ? Assuming temp is around 40 deg C that should put the fluid at correct level, right ?
4. Does any of you 7AT owner who had a test pipe have this issue ?
5. What will be the best way to identify where the leak come from cause it only leaks when the transmission is hot after a run.

Car is out of warranty...zzzzz, 60k miles, 4 yrs.

Zen