My lathe is no longer doing c axis contouring. The c axis will jog in manual just fine, but when running a program, it will load up to 163% and alarm out. I have ran 3-4 programs cutting a square end on a shaft milling axially. I tried again today and the c axis loads up and alarms out. It will position just fine, but when it starts the cut it’s not rotating. The alarm is 1181-20 alarm-a mcs diff over spdl-1 17ae