I had a discussion yesterday while I was at the Almerimar pro-shop. Here is my understanding of what work is happening on the greens next week.
On Monday 23 April the Master 3 (Classic) course will be closed for hollow tining. The course used on this day will be the Master (Master 1 & Master 2) course. There may be some restrictions on playing on the Master course later in the day.
On Tuesday 24 April the White course (Master 1, front 9 Master) will be closed for hollow tining. The layout used on this day will be winter Red & Blue.
From Wednesday 25 April onwards the Master (Master 1 & Master 2) course will be closed for some time. The only course open will be the Master 3 (Classic) course.
As yet, I am not sure when the full 27 holes will re-open following the work on the greens. One I know I will publish something here.