The hinges are attached with bolts through the center pillar, and can be reached by removing the cover panel. The bolt heads are captured by the hinge design, so you just need to tighten the nuts inside. You could see if the nuts are loose. If they are, perhaps the hinges have dropped.
If they are tight, then perhaps the doors have dropped. The doors are held by 4 screws on each hinge. You can see them when the door is opened.
If they are loose, you will have to move the door to where you want it, hold it, and tighten the screws. Tricky job. That’s why I built the door alignment frame.
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