Hi there, I believe you need the links to be updated in order to remove any 404 errors. I can effectively handle that. I would, however, need access to your Google search webmaster console, then your website. Using a WordPress plugin, that is if your website is on WordPress, automate the process and deliver in a couple of days. Then subsequently, look out for further errors on your Google search console.
If you aren't providing access to your webmaster console, no problem. But I would require you to check it every day for at least one week to ensure no errors come up again.
I believe I am well equipped for the job.