TC feedback while adjusting air con airflow at cab(3621), the fender came off. ~~~~~ 3621 TC feedback while adjusting A/C air flow, the fender came off. CE found 3621 Temporary fix back Cab AC louvre but slightly Wobbly.  3621 security check on louvre - OK. C-ring shifted but within groove. Tried to manually dislodge louvre but found it secured. Au 44275