My vinyl windows wont stay up

A contractor from Madison al. 35758 says:
The vinyl windows I am looking at will not stay up. I cannot find any broken parts. Is there an adjustment for this. Stamped: (01/3) UNIQUE 27-C-30
User submitted picture of channel balance.
Profile picture of Paul
Paul from SWISCO responded:
Thank you for posting. I think that either the spring is sprung or the locking device on the bottom is broken. Either way, you will need a new balance. Please take a look at our S795-28 channel balance with the 28C stamp option.
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