Polar 115 EM code 87 when try to cut

Good morning to the forum members. This is a Polar 115 EM guillotine. The code 87 is displayed on the screen when the cut is pressed. The other functions have not been affected. The protocol has already been reviewed according to the service manual but the origin of the problem has not been found. Apart from what is recommended in the service manual, does anyone have information on what other origin this code 87 could have?
As additional information, the paper pressing crossbar is acting quite slowly, but we believe that it is an unrelated fault. Thank you in advance for your opinions.

Best regards