starting problems

HI
I have a zafira B 1.9 dti 120ch 2007 which became difficult to start.
I changed the glowplugs, fuel filter, oil change and cleaned the EGR unit. Fuel pump is working fine. No fault codes. I've even cleaned all the electrical contacts. Still difficult to start.
Car starts after a few tries and runs fine after. Doesn't matter if it's hot or cold out.
Any ideas would be greatly appreciated.

Thanks in advance.