Gap-fill assembly with PacBio reads
My understanding is that PBJelly is the tool intended to solve this problem.
This person seems to have used it starting with Illumina scaffolds. I have not personally used it but have heard that it works pretty well.
Edit: note that the PacBio ecosystem is not super easy to use from scratch. However, they have made pretty good efforts to facilitate setup using conda, as for instance documented here. This person shows a conda recipe for pbjelly.