Rhodes Chroma Polaris

My polaris seems to have what has been described here as the "bad S+H 
capacitor permanently detuned  scale problem ".... this appeared when 
i got it back from a repair shop.  Could something that they did  
there 'blow' the caps?  such as soldering an additional battery to the 
main board to supposedly save the memory when it was taken out of the 
unit? would this have temporarily doubled the voltage in the system? 
The tech claims that the "program is corrupted"  referring to the 
programmed sounds,explaining why they sound out of tune .  but he cant 
apparently reload the sounds, the unit wont take the new  cassette 
feed data.  ( or else  it does but that is simply NOT the problem )   
he doesnt say muchabout  the capacitors.. but I dont think he knows 
for sure... Ive tried to tell him about the S+H caps, but its as if 
they dont want to listen to what other people say. But the unit played 
OK for tuning when i brought it in....  any ideas on what would cause 
the caps to fail if supposedly only a slider and LED  were replaced.? 
last i heard  they just want to give me my money back  along with a 
disfunctional unit (the place is a large 'factory authorized 'music 
equip.  outfit for a lot of southern New England.} I wonder what has 
happenned.