DACO 24" double-hung window

A landlord from Wildwood Crest, NJ 08260 says:
The upper sash will not stay in the "up" position without it being latched.
I suspect the springs, or tensioners are broken but I really don't know.
What is the most common failure mode with this manufacturer's window?
I could repair it if I knew how to disassemble it.
Thanks for your assistance.
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Tom from SWISCO responded:
Hey, Don. You're right: if your sash won't stay up, then the balances are likely the culprit. I'm not sure exactly what type of balances your window has installed now, but you can look through our selection of balances and related balance hardware to see if anything here matches.
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