2001 s80 2.9 - p0455, p0011, slow accel

[Cal01s80]

I am having some problems with my volvo. First came an evap obd code, 0455. I have not been able to locate the leak. Is there a simple way to do this, or suggestions/advice based on model experience?
Second is the new 0011 code. Camshaft over advanced. I don't know what could be causing this. This is my first volvo, used.

I have 327k on it, clean oil. I need a trans fluid change because it is looking gritty. Also just replaced tensioner. Plans to change timing belt, and idler and water pump when I muster up the confidence and make sure I don't screw up.

I also hear a grinding-ish noise from timing belt compartment. Could this be the idler or pump bearing?