Steering problem

Boat has been running fine, but today developed a steering problem. Started to steer to port with a lot of resistance on wheel. Then no steering to port. Wheel just spins when turned. Steering to starboard is fine. What do you think do I need a new helm or just a cable?
I'll pull it apart on Monday to take a look.

Feeling pretty good about my seamanship. Managed to cross Boston harbor by using the wheel to steer to starboard and then using wind to blow me to port. Managed to avoid an LNG tanker and a couple of ferries. Even managed to pickup my mooring by steering to starboard and the reversing with the wheel over to starboard to move to port. Pretty tricky but I did it.