I don't know if this is exactly the same situation and it happened years ago, but I had a mechanical malfunction which resulted in a (nose) gear-up landing. I spoke to the FAA but not the NTSB and I never received any further documentation. All they said was, "We see this a lot" and that was the end of it.
That's what we are hoping for, so we wait.
The young man that came up from the operations side of FSDO only had one suggestion, that I get a new PPL card, mine is pretty shabby looking. He could not see the signature but allowed me to clean it and re-sign it in front of him, then took a photo of it.
we talked about how this happened, and I asked him if he was a pilot, he was, and I asked him if he thought he could have saved the landing, he said no, once it started around and I had no flying speed, I was there for the ride.
Things they were looking at were the maintenance records of the fairchild, mostly the 337s and the equipment installed by those.
the weight and balance records, which we had done after the restoration. My PMI had helped with that on one of the 337s, so that was prefect, and in the aircraft while flying, after they saw the FAA had been involved with the restoration they quit looking.
So, after the record checks and the formalities were done they started to look at damage and found there was no primary structure involved, took a bunch of pictures and said they were done and left.