I dont see any glue dowels holding the stiles(verticals) to the rails (horizontals).
If they are not there you have inferior doors probably from overseas (2 dowels in top,2 in middle,3 in bottom rail is what you should see). The only way to correct the problem would be to drill and install glue dowels (difficult at this point) Or drill first on the edge, use long screws in place of the glue dowels and wood glue on the stiles and rails ONLY. Then use wood plugs ti hide the holes in the edge. Do NOT glue the panels to the stiles and rails. The panels are meant to float (move around in the groove) to accommodate expansion and contraction due to moisture (humidity in summer, dry in winter). If you glue them they will split. The best 6 panel doors used to be made by Morgan door company in Osh Kosh. Years ago I visited their plant, plus 30 years selling building materials, selling millwork, and running my own woodworking shop is where my experience on this matter comes from. Morgan was bought out and is no longer in business. The time frame you bought your doors the door market was flooded with inexpensive foriegn made doors and still is although the quality now might be slightly better.
Good luck with the repair, hope this info helped.
PS: I would be looking for an old woodworker who needs a project to repair this door and I would use the long screws method (I've done it before) !
Bill
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