Someone on avherald noted it was a simple night service check:
Re posting this as people are insisting on the MTCE being done to the aircraft.
"Just to clarify any speculations, the plane was not down for mtce like many of you suggest here. All LAM planes come back to MPM for the night meaning no out station mtce. On the 28th EMC had a service check done that's all. And by the way flight 470 was not the 1st flight of the day. The plane had already done two legs that day MPM-JNB-MPM.