Client email change issue

[bear]

An odd one.
Client has opened many tickets in the past, using a Juno address. They recently changed that email, and have now asked that I change the old email that shows on the support index page. I can't duplicate this to show me more than one email on that page.

I'm assuming it's being called from old tickets or something, because a search on that email in the users table returns nothing. Tickets, no problem finding all under that email, search for email in relation to users, no good.

Is there a solution? I really don't want to have to update all the tables in the db to edit that email, as it's fairly pointless.