Ok, here ya go, just did mine... Be careful not to apply too much heat!!
First remove the four screws from the metal back.
Expose the circut board. Speaker is circled in red.
Remove the ribbon cable by gently pulling away from connector inline and the other connectors
These are the two solder points we will be de-soldering
Carefully heat and gently pull the speaker from the other side, work from one pin to the other.
Other side of the circut board with speaker removed.
Reinstall all cables and back onto the safe door.
Put cover back on, press red button, release when yellow light lights. Enter combination, then hit the 'B' button, or
whatever methood your safe requires for resetting combo. Safe will now work as before without the annoying noise...