Dreaded SAI/Evap monitors Not ready and P0442

[kk2002s]

Gelbster:
What issues were you facing?
Did you have CELs?
What remedy finally corrected it?
I have no CELs (Other than the super random P0442) so have Zero direction in terms of failed parts. I have read that slow worn Post O2 sensors could cause the SAI not to complete it's cycle. I have seen from my Phone app that (1) of the Post O2 sensors seems to come up much slower than the other as far a measuring voltages in a similar range and behavior.
I took the Plenum tubes and TB off the other night and I can see much more needs to come out to really do any investigation. I'm thinking I need additional diagnostic equipment as well. I don't want to get into parts throwing
So I'm starting to lean towards taking it to a shop, my first time.