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Source:
p. 1, b. 1-28
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The cautionary 
of d
2 in bar 27 occurs in the majority of the sources (the sign was removed only in GE3). It is probably a mistake, while the sign – completely redundant in this place – was supposed to be in bar 28, where it is justified. The in bar 28 was added in GE1 (→GE2→GE3).
Compare the passage in the sources»
category imprint: Differences between sources
issues: Errors in FE, GE revisions, Cautionary accidentals
notation: Pitch
Missing markers on sources:
FE0, FED, FEJ, GE2