SQL 2012 :: List Denied Permissions And Undo A DENY

1. A few months ago, I received a request to deny delete to a group (Windows AD login) against 3 databases. So I issued a DENY DELETE to the relevant Windows login.

2. Now, someone is having trouble updating data. The issue seems to be that a trigger fires during the update. In the trigger the code tries to delete from a table in the previously delete-denied databases. So the update fails.

-- In retrospect, perhaps I should have used REVOKE - not sure

-- Also, I can't seem to find a listing of the DENY permissions - or rather, how to list what permissions are denied. I guess maybe that is a hard thing to do if the result of a DENY is to leave certain permission columns NULL (vs adding 'DENY'). But it would be useful for me to see what the current permission state is.

-- Finally, I tried to undo the DENY without success. Here is my attempt.

a. I tried GRANT DELETE... - no luck
b. Then I saw an article explaining to use REVOKE, so I tried 'REVOKE DELETE' followed by 'GRANT DELETE' - still no luck.