Exhaust valves not stuck, is it the ECM or the vacuum pump?

[FtypeRpower]

So here’s the update, I’ve performed the TSB, the part from Jaguar (32 euro’s) is only a 6 meter hard lined vacuumline 5x1,5.
I had to take away the pump and reservoir and re-use the T-piece and some lines. It involves cutting a vacuumline around the engine, nothing too difficult and explained very well in the pdf TSB.

Some pics of what I took out and what it looks like afterwards.

Now I only have the problem left that the valves are lubricated but dont open on the spring completely, if I touch the valve by hand it can open a tiny little bit more…