Hi Colleen,
The situation is more worse as actually those corrupted roles were in production from past 5 years 
Now I recently joined this project and when some users raised an issue we found that few roles are corrupted. Hence we wanted to identify the root cause for the issue and found that it has happened because of a custom program.
So, now since we got the list of roles, we will analyze and then we just need to discuss with IT team and then need to follow accordingly 
Regards,
Madhu.