I had oil leaks originally from valve covers when I bought the 97 PA in Feb. Once they were replaced, still more oil visible at pan bottom. Last week while on lift installing the TransGo 4t65e shift kit, I had a good look around and found that the oil pressure sensor has a visible leak there. This is going to be a process of fix what is leaking above, eliminating all leaks sooner than later.
In my case it is hard to tell if the pan gasket is leaking. I am going to need some serious cleaner, power wash to all the steering /cooler lines and rags to dry after the new oil pressure sensor goes in.
Yup this is next before I determine it to still need an oil pan gasket.