Did you carry out the instruction in Old Crow's Polysix repair website? It says to carefully break the glue (loctite) securing the connectors (see his post) and to pop them apart without undue stress to the assy. Thereafter, inspect for any tarnish and reseat them to ensure a positive contact is made...
For each connector, after carefully cutting through the glue, start to work the upper connector+cable assembly out of the corresponding socket. These things can be stubborn, so watch the amount of force applied. Do NOT wiggle the connectors from side to side, this weakens the pins soldered to the KLM-367. If one or more connectors are being troublesome, grasp the connector shell at either end and try to "rock" the connector up and out along the connector's length. If you can fit the tip of a small, flat-tip screwdriver between the socket and connector along the open edge, it will help. Most connectors will give a final 'crack' as the glue that managed to get inside breaks, at which point the connector easily pops out.