Here's another try (scanning the slide) after brightening it, but now it blows out the highlights (no more distinction between the outdoor light and the hanging light on the far-right window). Still no details in the green hanging baskets either :/
Soon, I will be working with SFW slides from the 70's and 80s. I sure hope he kept the negatives!
I color-corrected in the expert settings (51, -51, 44).
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Here's what it looks like outside of the carrier:
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You can see the subtle difference in orange masking (comparing to Kodak Gold 200 of the same year):
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It's impossible to tell from a flatbed scanner but the SFW negative lets more light through, with less orange overall.