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FL uses a check valve inside there air tanks,,, so each tank is actually two tanks in one with the check valve in between them,,,your buzzer must be connected to the side of the tank that is not filling all the way up do to a failed internal check valve.
To find it I always install a fitting teed into tank drains so you can use a tire gage to check pressure,,once installed they can stay installed and you can see which tank needs replacing.
I have heard of guys removing all air from tanks,,remove discharge line of air drier,,pour some dexron atf fluid in line and put back on,,then build air again and see if that loosens up bad check valve,,,if not you would need to replace tank.
Any questions or problems let me know 'm happy to assist.
I'll add a picture of fitting you need to install to make it easier on next reply