The corrections are about bow strokes, dynamics and phrasing. It is also advisable not to lengthen the last note of each phrase and to clarify the articulation, which is softer. The piano should not stand out there should be a balance among the three parts and they must pay attention to the voice imitations.
There are other comments on harmony, rhythm, and tempo, and some details explained about the piano part. The group has to be aware of the moment when the cello needs extra time on the high note of the solo, so that they all can rapport together.