Update: Fixed.
I don't think the following answer I got was posted here: " If you remove the left rear wheel and the inner wheelwell splash shield, you'll be able to see a maze of hoses and valves that make up the ORVR and evap leak detection pump systems in that LR fender area.
There is a vacuum line that runs from the engine to that pump and it is common for it to split or crack over time, that is likely the hissing noise you hear. The codes you are getting are probably related, either due to that vacuum leak (the pump can't work properly) or another related line in that area is cracked or leaking. The pump assembly is mounted on a bracket there, so you need to loosen but not remove the bolts and swing it down to reach all the various hoses. If the bolts are rusted and can't be removed, you'll have to remove the rear bumper cover (fascia) to get at everything."
After removing the inner wheelwell splash shield I already saw the cracked hose. I didn't even have to mess with the pump bracket. Got 4ft of 1/4" hose at the parts store for $5.16 and a few new rivets ($6) for the splash shield (they all broke while taking it off), replaced the hose, put the splash shield back on, reset the engine codes and 2hrs later it is fixed.
Thanks for all your help. Axel