Thanks to all for the helpful suggestions. I tried them all: SR still seems to work (based on live view image - no time yet for sharpness tests), but it is definitely much noisier than before the dreaded drop. There are all sorts of loose and rattly sounds while it is working - much more than before, and of course more with longer lenses (as one would expect). Compared to my other body (K5), SR activity is now much noisier. Turning SR off does not prevent the new louder, harsher start-up noise. What is that noise (the short noticeable sound just as the camera is turned on - not the sensor cleaning noise, which was and still is almost inaudible)? Cleaning and mirror lock functions all seem fine. Live view works fine. So in summary, the result of the drop is just the louder harsher noise on start up, and the noisier, loose sound during SR activity - but all seemingly producing normal pics. I'll probably send it in, just to get peace of mind that the camera is functioning optimally. Main lesson: be much more careful using the quick release plate on the tripod!
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