Here's a thought just for now -

When you hit that one section that you keep messing up, make up something to fill in the spot. Perhaps just a chord tone of the chord in play at the time. The main thing is to finish the phrase.

Chances are that once you fill in that spot, you'll be able to play the entire phrase. Once you can play the entire phrase, you can go back in and work on that one section.

I'm betting though, that what you personally put in to fill the spot will be just fine - perhaps better.

Really.