Originally Posted by
Asturias56
"a question of risk appetite"
You mean she might breakdown in the middle of the N Sea???
No. There is a material issue with the shaft coupling. That doesn't mean it's about to fail. What it means is that some investigation is required to determine the rate of deterioration to see whether that might be an issue. Or not.
In the meantime, say the ship deploys on Steadfast Defender and then "might" need to go somewhere warmer for a longer period, there's a risk choice to make. Swap the ships now and guarantee you could support that extended period, or gamble that the deterioration investigation answer is " nothing to see here".