If it’s the same issue that affected ANA, then it is an engine swap fleet wide, with the old engines going of for some major disassembly. In ANA’s case RR handled the situation to the apparent satisfaction of ANA.
Pulling off the same level of customer service worldwide across the whole 787 fleet will be a bigger job. The fact that RR are reported to have made a statement to the stock exchange about the issue suggests that this could cost a big widget of cash, something that indicates a large amount of unplanned engine work.
If they have to divert staff off production lines to get enough manpower together to do the required rework, that’ll have a knock on impact on their production delivery. Better hope Airbus don’t resolve their production issues with the A350!
RR like any other company these days does not have large numbers of people on hand “just in case” something like this happens. Could be a lot of overtime being done in Derby this winter, might be a good year next year for the local car dealers / shops / etc.