The next student was a much older student, and she immediately realized what was wrong, stopped playing, flagged the teacher over, and then the teacher worked to fix it along with a couple of parents (my teacher was around 80 years old at this point and about 4 feet tall - so mucking around inside a grand piano was physically almost impossible for her).
I got to play again, and was so relieved.
Nothing like that happened today. I know my sister and parents would've loved to been here, but the timing just didn't work out. Here's the recording.