Thanks for your reply, rspi. I tried spraying the WD-40 into the latch assembly (without taking apart the door panel, just into the area that is accessible with the door open) but that didn't seem to fix it. Appreciate your reply all the same.

Hello, apologies in advance if this is a trivial kind of a problem -- blame it on my OCD :) . My right rear door warning light does properly light up when any of the other three doors are open (as it should) but does not come on when the right rear door itself is open. Nor do the other three door wa...