A few days ago, an Arik 737-800 declared a Mayday on final approach to Lagos when it lost an engine:
Nigeria: Arik Faces Maintenance Challenges Over Paucity of Funds - allAfrica.com
Probably all of those points made by JammedStab would apply to Arik today...
I watched and listened to an Arik 737 at Enugu about four months ago having to repeatedly shut down and restart its engines in an attempt to "clear" an unidentified fault. It got going eventually....