Background -- I own and have read the Curse of Strahd, and know of some information that exists within the book but cannot for the life of me remember where I read it in the book. Short of reading the entire book again, I don't know how else I can find what I am looking for. Is it off-topic to ask where I can find this information in the book? Will my question be downvoted into oblivion for essentially being a "read the book to me" question, despite the fact I have read the book?
Yes, it is on topic to ask along the lines of "where are the rules/content/etc for this specific thing? I know it's there but can't find it." We handle this in the content-identification tag.
We will point you to where it is in your book, but we (likely) won't be reproducing it for you unless it'd be within fair use — that makes it not a "read the book to me" question.
A recent key example is What D&D manual describes this game dragons play?, where the querent was sure a particular form of game existed in-universe but didn't know the name or where to read about it, and both were provided along with a brief summary of the content being asked about. (This is the Xorvintaal question, for those who may have seen it before.)
You'll be downvoted if it's totally obvious, like if you ask where the combat rules are in a book with a big old all-caps "COMBAT RULES" entry in the table of contents, but that's normal research-effort basics.