Disk Error: Offline uncorrectable sectors

Hi,
I received errors on the disks.
I will start by saying that I always do the monthly long smart tests and the short ones more often.

The errors are these:

Device: /dev/ada3, 8 Currently unreadable (pending) sectors.

CRITICAL

Device: /dev/ada3, 8 Offline uncorrectable sectors.

CRITICAL

Device: /dev/ada3, 24 Currently unreadable (pending) sectors.

CRITICAL

Device: /dev/ada3, 24 Offline uncorrectable sectors.

What do you say to do? Does the disk need to be changed? Do I have to do a long smart disk test first? How do I do it?
Thanks

Try the Drive Troubleshooting Flowcharts in my link below. It should get you to the answer fairly quickly.

If you have a problem with the flowchart or could recommend improvement, please let me know.