SKJ operated SQ336 to Paris on Nov 29, but diverted to Dubai with engine issue. I hear #4 needs replacement. SKH came to rescue and took over as SQ336D.
Remember this is the 3rd Singapore A380 that had an issue that needed an engine change: in Tokyo and Singapore 2015, now this. MAS suffered an issue earlier this year that kept her on the ground in Dubai for a few days. That's 4x Rolls-Royce.