Awesome song off their new album Advanced Basics that came out today, the song is really easy,
I am 100% sure this is correct, playing along to the song what I tabbed is dead on

Half Step Down

Fill
F5-F5-G5-G5

Intro
Ab5-Eb5-F5-F5

Verse(Root means the single note on the lowest string)
Ab5-Eb5-C5-F(root)-G(Root)

Pre-Chorus/Bridge
Ab5-Eb5-C5

Chorus
Ab5-C5-Eb5-F5

SONG ORDER
Fill
Intro
Verse
Pre-Chorus
Chorus
Intro
Verse
Pre-Chorus
Chorus
Bridge
Chorus