Below is an addition to the riddle that will serve as a hint. It's in white characters for those who do not want the hint. If you want the hint, drag your cursor over it with your mouse.

"Last week the man broke his leg, but being the hard worker he is, he continued going to work with the aid of a crutch. He's taken the elevator all the way up and down since."

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7