Trans leaking only when parked

[Roxtar]

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Wife's 2011 RR Sport. Went out to find a large leak coming from under the crossmember. Large enough that it had spread beyond the car's footprint.
Looked like water but when I touched it it was clear oil.
Transmission fluid.
Took it to the (not LR specific) shop immediately and they are stumped. It doesn't leak while running, aka, under pressure, but leaks badly when not running.
Any ideas?

 

[discostew]

Can you post a pic of the spot its coming out of? Keep in mind that when you shut the vehicle off the trans fluid will rise in the pan. This is why you have the vehicle runnning when you check trans fluid level. Have you done anything like service it recently?

 

[Roxtar]

Talking to a shop that specializes in LRs, the ATF in this model is not clear, as first thought.
I then thought, brake fluid, clear and slippery.
Nope.
Now, the shop is saying it actually is coolant. They did a pressure test and when it hit a certain pressure; boom, it leaked heavily.
That explains why it leaks primarily when the engine shuts off. The coolant pressure spikes after the engine is shut down. It's a light enough pink that it appeared clear.

 

[discostew]

What color does he say the trans fluid should be? I thought you said it was leaking near the trans crossmember?

 

[Roxtar]

They said the atf should be brown.
I meant the crossmember at the engine/trans junction, under the firewall.