French door dropping and hinge adjust lock question

[mat_rew]

One side of my French doors is sagging, I checked online for possible solutions and the most obvious seems to be readjusting the hinges however only the top and bottom hinges have allen key slots for locking the height adjust, all three (top, middle , bottom) have the allen key slots for (presumably) adjusting height. Has anyone else dealt with something similar to this? 

[gaz_moose]

are the height adjusters not on the top and bottom of the hinge under plastic caps? are the hinges loose on the frame if you grab and rock the door?