Help - my rear doors are locked and the threaded posts are not visable. I took the knobs off to replace them but locked the doors without thinking about it. the front opened but not the back. I cant open the door to get to it from the side . can i get the door panel off without the door open? any help would be great.

two other things - my glowplug light is not on - how do I replace it -

and my tach is not working - can the sensor be cleaned? are there any sites that have how to's ? thanks in advacne, Cary