Codes P0403 and P0406

What is your question?

Replaced egr valve. Someone on here said it could be a vacuum leak. I don't know how to respond to the answer to ask another question. So I'm doing this. Sorry. If it is a vacuum leak, could it be a gasket? Is the egr valve also the solenoid? Are they together? Can anyone show me a diagram of the egr system or the emissions system? And wiring diagram? Or all the vacuum hoses or pipes? I'm at a complete lose.

What makes this problem better or worse?

Car seems to run fine. RPM’s maybe a little high when just idling.