How do I remove a Sophos SFP DSL module from an XG125?

I have read this: https://www.sophos.com/en-us/medialibrary/PDFs/documentation/sophos-sfp-dsl-module-mounting-instructions-rev3.pdf?la=en

but it only explains the installation, not the removal.

The removal is NOT obvious.

Any ideas?

Thanks, in advance.