One additional tidbit…
A broken gear handle Uplock cable will be apparent because without the Uplock released, the gear UP red light will stay illuminated. Basically one red, two green would indicate the Uplock did not release on the gear indicating red. Instead of trying to find which cable to pull, raise the gear by putting the gear handle in the UP position, then pull all three cables with your left hand and use your right hand to lower the gear handle to the DOWN position. Momentarily releasing the yoke will be required, so don’t do this near the ground, but while maneuvering at a safe distance from the traffic pattern at about 100mph. If you try to pull the three backup Uplock cables with the gear handle in the DOWN position, you are trying to release the Uplock with 1000psi hydraulic pressure pushing against the Uplock hook and roller. You may end up breaking your backup cable in this scenario. Without pressure on the system (hydraulic leak), the Uplock should release easily.
VR, Tom