Window lock repair obligation/advice?

[Ashley Pinnell]

Hello, 

We have double paned windows on a rental property that we are rehabbing, and the locks on the inner windows do not work. The locks on the outer window panes are fine however. As landlords, are we obligated to repair the locks on the inside? Also, if anyone has experience with how to repair or fix these locks we are willing to do it but stuck as to how. Our contractor can not figure it out either.

Thank you in advance!