Subdomain accidentally deactivated – how resurrect posts on main page

Hi Ron or whoever answers – former mu forum subscriber here. This wonderful plugin has been a mainstay of my multi-site multi-author blog. I use it display all posts published on subdomains on the main site. Recently, I accidentally deactivated one of my subdomain sites. Not sure how that happened but no problem, I reactivated it. However, I have since discovered that all the posts, i.e., hundreds of posts on that subdomain have disappeared from the mainsite (tags page?). Is there a batch method for making them show up on the main page again? I tried a batch edit with no changes but not a 414 too large error message

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