E5 error millplus control

Hi all, I have a deckel with a millplus V520 control.

This was out in estop for the weekend. Taking out of estop and enabling the machine I have an E5 error. This points to overloads on the coolant system but all OK. How do I see what's bringing this alarm. Below items have checked out OK. (item 2 not found in schematics)

E 5 Breakdown coolant/chips transfer
Symbols:
1) IX_KM_NEG_MSS_SSA=0

2) IX_KM_NEG_MSS_Stoerung=0

3 IX_KM_NEG_MSS_KSA=0