Rhodes Chroma Polaris

Well, my mint Chroma Polaris was attacked by a falling ride cymbal  
resulting in two bent and damaged sliders in the filter section on the  
left hand panel: resonance and sweep depth.  They are both loose and  
nonfunctional.  Resonance slider does respond if you press very hard  
on it.

I have never cracked open the Polaris (no need as the membranes are in  
excellent shape).  Can the sliders be easily replaced (or swapped)?   
If so, does anyone have two spares or can direct me to a source for  
parts?  Or, is an entire replacement left panel needed? (I hope not!).

Thanks in advance!