I have a 24f. It sounds like the t-bar locks under the dinette are adjusted so they rub. If you look under the slide you will see two metal channels. Follow them back to the seal, pull the seal down and you will see the t-bars. I say this because the slide is making noise during the first half of the extension and that is about how long the t-bars are. I’ll send pictures in a post when I find them.
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