The elevator is common for all the members and your cannot restrict the use of others as a right.
You can request the other members to contribute for its repair expenses since it is being commonly used by all and can also put a display board outside the gate of the elevator the details of expenses and the amount each member has to bear towards the repair costs.
Since the name sake society is also functioning, you may ask the society to issue a circular for recovery of the amount you have spent in common
You can give a written representation to the society giving the details of the expenses incurred to repair the unserviceable elevator and make it serviceable