What was that?

Yesterday morning the Trinity choir presented its special Christmas music.  In the middle of the second piece I heard a loud bang from inside the piano, and the damper pedal stopped working, leaving the dampers off the strings.  What a weird thing!  We finished the song, but a few minutes later we were able to look inside the piano.  I hoped the rod that connects the pedal to the damper bar had come loose and we could just put it back in place, but no such luck.  I played the final piece on the organ, which scared me a bit since I hadn't practiced it that way.  After the service we looked more closely but could find no loose connections.  So we have a call in to the tuner/technician, hoping he can fit us in this week without it costing too much.  Julie and I had planned a couple of flute/piano duets for the Christmas Eve service, but I will choose alternate pieces just in case we can't use the piano.