red hot is played in standard tuning
part of the sound o the song is Robert never strums the low E string though out, gives a few of the chords an inversion feel, he also uses his index finger nail to upstroke a few of the chords giving them an unique feel.
so the introduction chords are C D7 G7 Cmaj7 C Cmaj7 F Fm G7
verse by lines C B A A7 D7 G7 C
C B A A7 D7 G7 G7/B
C7 F Dm7b5
refrain
C G7/B A A7 D7 G7 C D7 G7 C
song ends on a C6, (an inversion played by freting the D,G,B,E strings at the 5th fret)
thats how I hear it.