Unfortunately the only people who can tell you exactly what maps are on the ECU is the original tuner who tuned it. Regardless of how long its been they should have the original tuned rom file, so even if they don't remember its as simple as opening the file and taking a look.
If you want to be able to reflash it yourself you will need to purchase the interface cable, but you do NOT need to purchase a license, so that will save you some money. With the basic interface cable you will be able to reflash the ECU and datalog, but since you're boosted you're pretty much out of luck with etuning. No protuners that I know of will tune forced induction remotely.
If you want to be able to tune it yourself or have someone else tune it locally you will need the tuner version (tuner add on since you have the license already), and you will have to start from scratch with the tune. No way to modify the tune that's currently on the ECU without getting ahold of the original tuned rom from the original tuner.
Feel free to PM me directly if you have any questions about how it all works..
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