Default return for repair with s-off

Can i return my phone with s-off, Bootloader locked and origenal software without voiding warranty ? My screen is broken...
Device : HTC One M8 2.8Ghz "Gunmetal Gray"
Status : S-OFF With Supercid 11111111
Recovery : PhilZ Touch
Kernel : ElementalX
Rom : Android Revolution HD
Mods : Harman/Kardon | Sense 6 Toolbox