Get a roll of 2" blue tape, start taping all the joints near the area, drive it & see if it stops. Another option on the front door- spray silicone on the metal ( i say metal, meaning the door frame or the door shell, whichever does NOT have weatherstrip). Close the door, open it & look for shine on the weatherstrip indicating a seal. If you see no shine on spots, there is no contact. Remember, the noise could be coming from an outside source, like the mirror or arms. The RV repair near me has a big fan in a board for leaks. They mount it in the doorway, turn it on & spray soapy water on suspected leaks. Maybe that would work. Cheap solution- get ear buds.................