Okay, I haven't see one with the intro/melody and chords yet. Here it goes
[ Tab from: https://www.guitartabs.cc/tabs/a/al_green/lean_on_me_tab_ver_2.html ]
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-----0-2-3-3-2-0-----0-2--2b-p-----0-2-3-3-2-0-----0-2--------|
-3-3-------------3-3-----------3-3-------------3-3-----2-3----|
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thats played over the chords for most of the song
the bridge should be played rough and strong imo, it just sounds better. I think theres
tab on here with the correct chords as well. Check that one too to be sure.