Stage 2 Audi a4
 

Hi guys I purchased an Audi A4 that has an APR tune about a year and a half ago.
I do not know a TON about cars but I know a decent amount and knew about what I was buying.
When I first started driving my car it was generating about 24-26 pounds of boost.
As of recently I am unable I get more than 17 pounds and I think it needs to be tuned
I have done a bunch of maintence but I have never actually gone and gotten her tuned.
Do you think that this is why I am losing boost?
Also what exactly do I need, do I need to buy the tune kit from APR again and bring it to a shop?
Lastly, should I take it to a sports shop or can the average place take care of this?
I appreciate it guys thank you