Can you open the motor cover door? Does it swing open on the hinge?
If so, are there three ordinary screws on the right side hinge? Can you open the door and feel behind that panel to determine whether the screws go directly into the sheet metal or have nuts and washers behind them?
In either case, open the door, unscrew the three hinge screws, and remove the cover with the hinge attached. Reverse the process to reattach the cover.
What am I missing here? Why must the cover be removed, rather than swinging it out of the way?