Code P0171, vacuum line replacement instructions needed

Clearly vacuum leaks will cause this issue so you are on the right path. As for showing you how to fix these lines, that may be easier then you may think. Normally vacuum lines can be replaced with bulk line so I would suggest getting a couple of pictures of the lines that you found broken and we can try and identify the line and then all you need to do is follow it from end to end and replace it and then secure it back it place.

Let's start with some pictures and go from there. Thanks

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers