Completely missed the point!!!
I realize the engine did NOT start, however this shows that there is a problem with the 'engine', or associated startup sequence.
These engines need correct maintenance, as they are complex, and if they have it there should be no problems, starting them or running them!
In this case it would not start, could be many things that would cause that. From a switch, to the APU, to the igniter??? We don't know.
However it did start at some point, because the article states........
"The faulty plane returned empty to Bangkok for repairs once initial checks were complete. "
So repairs were needed to the engine, now that would mean something needed changing, replacing or fixing. This happened before the aircraft was carrying passengers, so as I said in my original comment.
"These kinds of things happen all the time, good job any problem with the engine was found out on the ground, BEFORE it took off! "