Surprising how much a refit costs, the actual money spent on the vessel is a fraction of the total cost, its the fees the shipyard charge for dock or floating dock and the fees for the work, a prime example is it cost £10000 just to replace a control room tiled floor I know of, not a big floor area either........
Although you mention the engines Gil, it would of been a huge benefit and bigger seller for the Ocean to replace the Pielstick main engines.......
Marine Engines are ordered in advance of a build, unless the big companies have a few ready to go....... and this is only down to cancelled orders etc.