1.027 is just slightly higher than Natural Sea-Water, averages 1.025-1.026 for most reef areas (99% that is accurate), it's doubtful the elevated salinity was the cause or that it would do any harm.

With that said, changing the SG up or down rapidly will likely cause more harm than good.... the SG may have crept up through evaporation, that was a gradual thing that happened over a span of at least days, it should be lowered in the same fashion, over time to reduce stressing any inhabitants. Inverts are particularly sensitive to dramatic swings of most anything in the water column.