MRC00

Hi guys, I'm loosing my mind. 7 mechanics and no fix. 2022 2.0tsi Kodiaq (DNNA engine code) 40k miles Despite being under warranty, I'm already out of pocket £1550 because "there is nothing wrong with the car". Car spent a total of 18 working days across 3 garages. 2x Skoda dealers and 1x Independent Specialist place with outstanding feedback and a great bunch of guys. The issue. When accelerating car makes a kettle whistle noise and wooshing/boost drop noise when lifting throttle. Every time no matter the speed or revs. Overboosting like. Back in February, car was only making a whistle noise when accelerating, suddenly on a motorway. Stationary, nothing. In May this got slightly louder and now you could reproduce the whoosing/dumping excess boost sound reving in stationary, but no whistle. No fault codes, ever. On a handful occasions I experienced a hesitation when pulling away, press throttle, nothing nothing and then full power. No fault code no ELM even for a second. Not sure if related. 4 master techs with combined 110 years experience can't figure it out (dealer and indy) plus 3 non master techs. Work done so far: New PCV valve New Air/Boost pressure relief valve (by the turbo after the air intake pipe). Entire intake and charge system stripped, checked for cracks and any blockages. Every pipe and clip inspected, even a camera inside the intercooler. Boost pressure cleaned with alcohol. Brand new air filter, no splits, airbox fine too. Air leak test x2. You name it. Sound is located on the right hand side near the air intake, valve dropping/diverting excess boost back in the air box. No idea where the whistle sound comes from as it only happens under load. If you can help, please watch the entire video, sound only. Thank you very much guys, much appreciated.