Hi @mgilbert
If the input datasets are correct and intact, then you might just need to rerun the jobs. Some very small fraction can fail for odd reasons. The servers are running thousands of jobs every day.
If these were run inside a collection, you might be able to use the the rerun function and replace items in the original collection. It will show up on the tool form right above the submit button, just like this option. Resume paused jobs - #2 by jennaj
If you are not sure if the fastq format is OK or not, try running FastQC or Fastq Info on those datasets. Tutorials: Search GTN Materials (query = quality)