The find-clip-of-frame (fcof) utility scans all the libraries on the specified volume searching for clips referencing a given frame. The output tells you which clips use the frame and where they are located. When a large list of invalid frames is detected, it is usually more efficient to find the clip for a given frame, delete it, and perform another integrity check before searching for the next invalid frames. Very often all invalid frames are in the same few clips so finding affected clips for each invalid frame is unnecessary.