The report seems to suggest that fuel manifolds in both engines were somehow not fitted correctly and stress fractures caused leaks in the fuel system. The engines appear to use a vacuum system to draw fuel from the tanks, so presumably the fractures allowed air to be sucked into the fuel system depriving the engines of sufficient fuel. Both engines had similar failures due to the same incorrect fitting of the manifolds on each engine. One failed shortly before the other.
The pilots ignored company regulations specifying an immediate diversion and landing after the first engine failed, did not refer to checklists or quick reference handbooks, and squandered the altitude they had before being sure they could make the airport.
The usual combination of factors adding together to create a disaster which potentially could have been averted.
This appears to be a no holds barred report that reflects quite badly on the standards of the aviation industry in Nigeria and events that happened immediately after the crash. Hopefully the necessary lessons will be learned and improvements made to aviation safety, but that will require proper financial investment and enforcement of checks and regulations.
An interesting read.