You are correct that 07073 has nothing to do with the transmission calibration. 07058 if related to that. It was initially a TSB (Technical Service bulletin) and they made it a recall over the weekend. Supposedly, GM was behind in sending out the email and I thought it was new on for the transmission, but I already had that one done.
A little more on 7073 or document ID 1914921. Addresses three separate issues:
(1) Wiring harness under driver seat. Remove seat,
inspect harness for binding/pinching tie wrap harness
out of harms way. Don't attempt yourself, an airbag
module is nearby. Only applies to vehicles with power/memory
(2) Open/close rear lift gate 3 times in succession
using the switches on the liftgate. If no problem,
nothing further is required. If problem, replace
(3) Lubricate the I-shaft bearing/boot with GM
Superlube®, or equivalent, to relieve the friction
between the boot and the carrier. This is a simple
procedure to lubricate the intermediate steering shaft
boot/carrier contact points and is done from the
interior of the vehicle.
I took my Acadia in this morning for a couple of recalls but while the # 7073 popped up on my vin# they had no additional information as far as what it was for. I get my Acadia back tomorrow and I'll find out if they did anything under 7073.