On Sep 17th 2015 the FAA reported the aircraft struck approach lights on departure from Miami and continued to destination. The aircraft received substantial damage to its belly, the occurrence was rated an accident.
The above from the very first entry on the thread begs questions as to who first found the "substantial" damage, who it was reported to, and the like. The infamous "Who knew what, and when did they know it?"
"Substantial damage" would seem to have been obvious to bag handlers chocking the a/c at the arrival gate? Well, maybe. But surely seen by the first line mech to visit the scene whenever that was. But somebody informed FAA. When? The latter, however, would not have been the first people to be properly informed of whatever was found. Logic says, though, that the discovery had to have been made in time to preserve complete FDR data right there at the beginning when the a/c was first grounded. I don't know what exactly would be the investigatory protocol, but I can envision it would have begun very soon after landing, and would have resembled something like the proverbial "flies on stink."