purpleviolin,
You've received excellent advice, I'll just add a mention of wrightslaw, a great resource (which you may already be familiar with): https://www.wrightslaw.com/

This recent Wrightslaw post may be of particular interest:
Are Kids with Passing Grades Eligible for 504 Plans and IEPs?
April 16, 2023
https://www.wrightslaw.com/blog/kids-with-passing-grades-eligible-for-504-plans-ieps-yes/

This page of the Wrightslaw website lists many of their articles and updates on 504s. https://www.wrightslaw.com/info/sec504.index.htm

Hopefully, something in this list may benefit your child, and also future readers of this thread.