Ideally the components under suspicion should be tested and replaced only if found faulty. However, if you are DIY it sometimes pays to replace a suspected part if it's not too expensive. Boost solenoid valves are around $100.
P2263 refers specifically to turbo performance, so the vacuum operated boost control solenoid would be my first choice in the blind replacement game.
Sometimes these valves make a buzzing noise when the engine is turned off. May or may not indicate faulty performance.
The valve is controlled by pulse width modulation.
While
MAF/MAP and EGR faults affect turbo boost,
MAF/MAP and EGR each have their own specific fault codes.
A few years ago around 130000km I had P2263:85-27 code on my 2011 diesel. EML and limp mode. Replacing the valve fixed mine.