Chevy Silverado Door Ajar Indicator Malfunction

I haven’t taken the door apart at all to access any switches. No prior damage or anything. This condition started when I returned from a trip and got in truck at airport parking lot. Interior lights wouldn’t go out and the display said left rear door ajar, so I stopped, opened and shut that door to ensure shut, and still didn’t go off.

Turned off, took out key, restarted, and no indicator. Started again after about a week with no problems. Now, the interior lights won’t go off at all even though the door is closed. Still get the control panel warning that the left passenger door is ajar.

If it is something I can easily do, I’m all for removing panel to access wiring/switches. I just don’t see anything by looking at door or frame to indicate any electrical circuit.

About to resort to dealership, because I don’t even know where to look for problem.