ok if the broken wire is not in the mast harness then check the other areas up to the manifold block. There is a short harness going from the connector at the base of the carriage upto the manifold block (solenoid block). Even check the solenoid wiring. There is a break somewhere in there.
You may also want to check the fuse on the sicos controller and the wiring at the control handle. There is an open circuit somewhere in that circuit.
i would even check the harness going from the main manifold block out to the auxiliary solenoids in the front of the pantograph, it is a prime target for getting cut or smashed.