PTO Seals
There are two and one in inboard of the bearings. If the inboard seal fails, the outer will fail shortly after. So best practice is to split the cases and replace all seals and inspect bearings. In most cases if you catch the issue right after the PTO seal shows symptoms - the bearings are still good and do not need to be replaced. This holds true for the iosflex lubed bearings as well.
New seals (and Iso if applicable) and you are good to go.