I think this is second of scheduled major refit, not really MLU, the first major refit was in 2018, major work involved resurfacing of top deck and repainting of the bottom Hull. That was around 5 or 6 years after commission. Current refit is about 4 1/2 year after the 2018 refit.
I expect MLU to be carried out around 2035. CV16 should serve for 40 to 50 years from 2012.