Reduced Engine Performance under hard acceleration 2011 T5

[Belatu]

I took delivery of a 2011 S60 T5 on Saturday with just over 130,000 km on it, overall the car drives well, and has great performance, however when driving at highway speeds and stepping on the gas the cars throws a "Reduced Engine Performance" Warning on the DIM as soon as the RPM goes above 4000, and the engine stutters a little.

Letting up on the gas immediately resolves this and the car drives fine otherwise.

before I took delivery the car was thoroughly inspected, and some work was done including replacing the Powershift Gearbox Sealing Cover and a fix to a cracked rubber pipe into the Turbo.

Any Idea what to look out for, I'll probably take it to a local indy to look at soon, but would like to have an idea of what might be causing it.