quick flash question

i am taking my truck in to the dealership on monday to have the door handle and lock assembly replaced (good for nuthin' theif with a screwdriver) so while its there i am thinking about having the latest flash done (if its not already been done) but before i do so i have a few questions.

1. first of all I have an Oasis report but i do not see where it has ever been flashed before, only shows the work on the reverse planetary assembly in the trans and the recalls for the harness protector (05S34) and the "EPS Sensor and recalibrate" (05E15). All of this was done on 5-1-06. Am i missing something?

2. My truck starts and runs perfectly but since i have only had it since April I do not know what it will do in the winter. should i leave well enough alone or get the "heat induction flash" if available"

3. Is there a flash number to ask the Service manager about so that i know we are talking about the same thing?

I would also point out that i know I do not have the "buzz flash" i am always reading about as there is no buzzing at shut down so could it be that it is as it is the day it was purchased by the first owner.

Thanks and sorry so long