I received my FT-991 back from Yaesu in the form of an FT-991A. They do not replace the front bezel, but the radio has a new sticker on the bottom showing that the model is a FT-991A and it has a new serial number.
I’ve attached a video of the radio in action, and also I demonstrate the new Digital Noise Reduction function. I had read somewhere that the FT-991A had an upgraded DNR and upgraded DSP functionality. It does seem effective, but I can’t decide whether I like it or not. I’m sure I’ll get used to it.
Anyway, I’d like to say thanks to Stephanie at Yaesu for all of her help, the contact, and the service. I’ll likely update this post as I get more experience with the FT-991A.
See my related post documenting the run-up to this upgrade here: http://www.ad5gg.com/2017/01/24/ft-991-hardware-upgrade-kit/