Peaurl

long story short, squirrels got under hood and nested, ate vacuum lines and various other wires. Mechanic said shorted my computer which he replaced. When I drove it back all was well except a little hard shifting from 1st,to 2nd to 3rd. Didn't think much about it since it has set up all summer. Today I drove a pretty good bit, the longer I drove it the harsher the shift became, especially from park to reverse then to drive and then same back to park? Any suggestion? Did he miss a wire somewhere or is there a slight adjustment that I can make to smooth this out. I'm hoping transmission is not the problem. Thanks for any input.