window balances

A handy person from new jersey says:
May 7, 2020
my window sashes make a loud screech/squeak and are very difficult to open and close. they are Andersen double hung windows (both sashes move). they are not tilt wash. I believe they were purchased and installed in 1985 (approximately)

Am i correct in assuming that the balances need to be replaced? if so, which balance do I need? below is all the information i have:

visible glass in both sashes is 32 1/2" wide and 24" tall

current balance has the following numbers on it as far as i can tell. its difficult to read: 11600-17 E82 9#27 2 84

is there anything else i should do to get them operating smoothly once again?
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Tom from SWISCO responded:
May 12, 2020

Yep, it definitely sounds like you need new balances. I recommend our 24-939. This can replace all Andersen balances marked with "9#27."

There's not much else you need, replacing the balances will get the windows working good as new. That said, applying silicone spray on the sides of the sash track can't hurt.
A handy person from new jersey says:
May 12, 2020
Great! Thanks so much for responding. I will place an order with you today.
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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How to replace an Andersen Window Balance
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Andersen's Narroline Sash Balances
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