First disconnect any wiring if any. You should have a pedestal that is bolted through the floor. Unbolt the entire chair from the top portion of the pedestal and turn chair upside down where it is easy access and remove the rotation/slider mechanism from the bottom of the chair if need be to make repairs. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7