First of all, thanks a lot for your answer. I bought a diagnostic tool (obdeleven) since the VCDS does not belong to me. After I will get it, i will constantly monitor the activity of the car and come back with an update.

Moreover, regarding the car functionality, I can say it is operating correctly, maybe with 2 issues regarding the faults mentioned above (but I am not sure of them).

1. Since the car has a DSG shift box (I drive most of the time in Normal mode, never in ECO, and sometimes in SPORT) when it is set in Normal mode and I spontaneous push the throttle paddle to the floor there is a lag (maybe this is the one that is called the Turbo Lag) or is something about the fault ("Throttle actuator control circuit ")
2. I tried several times to voluntary trigger the alarm honk, but without success. I tried to slap the hood, kick the rims or force the door or the trunk (this was yesterday when I found out about the siren fault). What is unclear, is that some time ago I forgot that I locked the car and when I wanted to open it (softly) the alarm was triggered. It is possible that the fault codes is part of a incorrectly tweaking, I mention that my only tweaks on siren part were to activate lock/unlock beeping (without success, still this is a simple tweak)

Regarding the motor for left temperature flap I don't know how exactly to test them (I get airflow from all the vents on the driver's side). As long i understand this is related to the climatronic module, but this is functional (I will continue the investigation and come back with updates)