Something I had not seen in the link from A-Floor to the BBC news item at #237, which could be a complete red herring or........................
"Globo TV also reported that the same plane had problems landing at Congonhas the day before the crash. The channel said the plane only managed to stop at the limit of the runway. The pilot told air traffic controllers it was very slippery but did not mention any other problems, the report said. "
My bold
I see the TAM MEL has no restriction on slippery runways.