Polar 76 em error

i think it is the backguage limit switch error.
try replacing it. is the back guage in the middle of the table or far at the back?
 
I am not saying this is the problem but has your cable been changed? I have found backgage errors appear because the cable running from the machine to the backgage has gone back and forth so many times it breaks a connection someplace. I have replaced two cables on ours. Lots of years and lots of cutting.
 

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