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Here is a service bulletin for him to follow. It involves adjusting the door latch mechanisms in the doors. Usually this will correct this, but if not, he will need to disconnect the wires to the door locks on each door one at a time to find the one that needs cleaning or replacement. A problem here will also affect the interior lights causing them to flicker.
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Your last sentence says "A problem here will affect the interior lights causing them to flicker." Which problem are you referring to: the door latch mechanisms or the cleaning/replacement of the wires to the door locks?
Lastly, are these the only two issues that affect the lights flickering and to doors going crazy? If not, what are the other remedies?
Yes, the door latch mechanism will cause both the flickering and the locks going crazy. First step is to clean them, then would be to disconnect them one at a time until they stop acting up and replace that one that was disconnected.
That is by far the most common reason for both of these issues. Worse case is it could be a wire making a loose connection somewhere, but that would be tested afterwards.
Best wishes my friend!
Unfortunately i don't think you will want to get to involved with that..unless you feel comfortable to remove the door panels and then snake your arm in behind the inside door wall to get to the mechanism, remove it, then clean and install it :-(
If it were easier i sure would tell you, but i don't want to mislead you into getting into a big mess and end up breaking something. BUT if you are brave i can send you some info on removing the door panel..