After slamming shut in the wind, the left side cab door on my 3720 will no longer open. The button outside and the lever on the inside still move, but the door will not unlatch. Does anyone have any ideas? I have removed the inside plastic cover as best I can (it's held in place while the door is latched) and poked around with a screw driver, but I haven't made any progress. There's some nuts as bolts I can try to undo, but the presence of springs in the mechanism has me having visions of shooting springs and not being able to reassemble the latch correctly.