I did the fluid and filter change myself. I am hoping it is something easy like a disconnected cable or wire which I could fix myself.
fluid and filter change would not solve your pawl problem. what kind of service did you get to solve your slipping problem? rebuilt the transmission??? changing the fluid and filter will help the slipping a little, but the problem will just come back soon.
i don't know if there is an adjustment your mechanic can do to tighten up the park gears, so the pawl will go away. some ford transmission has this tightening adjustment.
Just for clarification, the pawl was working fine before the fluid & filter change.