Thanks! Have done more research and photos... Lippert Components slide mechanism is problem... broken teeth on gears on one side. Found "gear pack" on Lippert's website. $95. Wonder if this is a fix/replacement that can be done while unit is on the ground or if it must be on a lift. I want to do it right, but am trying to minimize costs. Any advice appreciated.
With information learned here and a bit of research, scheduled an appt to get the gear pack installed.... but t
hink they know I'm a savvy shopper and well think twice before overcharging me. Thanks folks.