435d n57 no turbo vacuum fault 244C00 and 27B900

[Bmwburner]

Had vacuum fault on my 435D Xdrive gran coupe less than four years old 244C00 and 27B900. Was traced to swirl flaps robbing all vac controllers for turbo waistgates using a vac pump with gauge. Went into drive train fault limp home soon as any beans attempted. Plugged T on vac pipe job done. Looked into replacing swirl flap 763 plus vat so a grand fitted not including motorised part, no danger.
Hope this post helps any n57 owners. Also found out bmw are selling 135 units per month.