Specialized S-Works Dual Suspension mountain bike

Specialized S-Works M5 Dual Suspension mountain bike. Combo of left/front derailleur grip shift and right/rear derailleur thumb shifter. Front suspension works fine and lock out, rear suspension works fine but no longer locks out. All other components function as they did when they were new. It might be almost 20 years old but like a lot of bikes, it hung in storage for a long time. All components are original so if you look close you can see minimal wear indicating very light use.