[hew]

Between the door unlock actuator and the unlock hooks there is a bell-crank, one on each side. Hydraulic pressure unlocks the hooks by pulling the bell cranks inwards. A spring inside the actuator pushes the unlocks out to reset them.
The bolt through the fulcrum had been overtightened so sometimes, usually first retreats, the spring only slowly pushed the unlock hooks out. Retracting the gear before the hooks had time to fully move out prevented the unlock switches properly engaging the legs so the doors didn't close.