Mine did same on driver side 2 days ago.
The drum came out using the 2 screws that are inserted in the drum: just remove the screws from their resting place (they have no function at all there) then insert in the 2 threaded holes near the hub center and screw in ...I did some heating with the acetylene torch before so as not to ruin the threads with too much torque. It came off quite easily.