So I received for Christmas a very nice 743 EF in maroon. I wrote perfectly out of the box and it was great at work when I have to put lots of info in a small space. Then, as I am a goober, I dropped it. The nib looks fine both to the naked eye and with magnification, but feels a bit less smooth and the ink flow is inconsistent and occasionally stalls. I know nothing of pen repair. and as a complicating factor the pen is from Japan. I have not heard back from Pilot USA as to whether they can address the issue. Any advice from the sages here?

thanks for any advice, Keith