What really happened at RIU, which led to that explosion

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Last week Thursday, we got the sad news that an employee( now we hear he is the Maintenance Engineer/Manager) died and three others were injured in an explosion in the Boiler Room at RIU Montego Bay.
Since the incident, there appears to have been a news blackout and nothing appears to be coming from anyone in relation to what may have transpired.
In the absence of information, I will seek to present some likely scenarios as to what may have occurred and what could have led to this taking place.
Firstly, given the fact that the Manager was in the room at the time, one can reasonable assume there may have been a problem and he was there to assist his team in finding a solution.
What do we know