The deletions visible in A reveal that Chopin changed the bottom notes in the 1st crotchet in b. 170 and in the quavers ending b. 170-171. It is possible to read the deleted versions, which allows us to reproduce (with high probability) the earlier version of the R.H. part in b. 170-172: 
. The last stage of shaping this fragment was the change introduced into b. 171 while proofreading FE2.
The second L.H. figure in b. 171 was also being changed.
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category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A
notation: Pitch