where are the sensors that trigger the "door open" in Dr. Door?

When go around a corner to the right, I get an emergency light, the interior lights come on, the lcd display screen tells me I have to put the car into park or the battery won't charge. Dealer found problem focused on driver's door; pressure from turn ( via driver's weight) pushes on the inside of the door. All goes away when pressure released. it appears that this squishing something leads to a contact and all the fuss. What is this likely to be and can I fix it with fair to moderate skills. Is this one part, a junction block, an incidental artifact or the work of gremlins? Where can I find procedure for opening the door panel to look-see, or to repair? Am I likely to be able to get the replacement from the stores? Is this common?