Hello. My 2005 Chevy Aveo oil light is flickering. I changed the oil pressure sensor a while back and it went away for a while but now the flicker is back. I changed it again, and this time it didn't help. I haven't gotten a pressure reading yet. Now at idle, my car is running hot: between half and 3/4 on the guage.

I will measure the pressure, but I am relatively sure that the pump is the problem. I will drop the pan and make sure there is no gunk, etc. in there. Another thread (which I lost) had directions to that.
Now, I've never seen what's underneath a oil pan so other than make sure everything is not gunky, I am not sure what else I can do. From some forum pics, I assume there will be a tube with a screen. Obviously I'll check that this is clear and clean. What else should I do with the oil pan off?

Now to the main question, assuming I need to change the oil pump, how involved is that? From the crappy manual I have I see that it is on the side of the engine. Does anyone have a step by step? Perhaps most important, would be a parts list. Once I start taking parts off, it's a long bike ride to the parts store...

Thanks,
Matthew