Looks like it is out of service from February 18th til April 1st. We were told that our January sailing on the Mariner was cancelled due to it going into dry dock, but they later corrected that incorrect email they sent all of us and said that they had just decided to cancel all the January - mid-February sailings on the Mariner since it was actually replacing the Independence sailings (which is going into dry dock) in January 2023.
Not sure what the plans are for the Mariner, but she was the first ship to be Amplified, so I would not expect them to do any major amplification type work on the Mariner, since many other ships (Allure, Explorer, Allure, Voyager) have not yet been amplified once yet