UPDATE

Here's a breakdown of total services provided. As far as I can tell, costs are very reasonable and about on par with what I expected for the TSB fix:

Trans Fluid Leak - Total Labor and parts: $140.16

FLUID AUT 1081033 - $20
PLUG ADAP 21003015 - $10.96
PIN NONE 21039022 - $1.20

(Hopefully this was the proper fluid/parts)

Safety Check - Total Labor: $135

(This was a complete 39 point inspection, mostly for peace of mind... green across the board)

I also had them check the mysterious fluttering sound during part idle and loud ticking during idle. Surprise surprise, they said it's NORMAL for this engine.

Total cost ended up being about $330 for all of this stuff. I paid it.