Sinumerik 840D alarm codes: error in monitoring channel

I am having issues with alarm codes: 

1. 27001 AXIS X1 error in monitoring channel, code 81, values: NCK 120, drive 6912

2. 201711 AXIS X1 AXX_00(11)

SI MOTION CU: Detect in a monitoring channel, 81

3.27033 AXIS A1 parameterization of MD $SAFE DRIVE LOGIC ADDRESS(3) invalid. 

(Note: we are trying to disable A axis since it is no longer connected with machine)

27060 Checksum alarm 

27035 Checksum alarm 

27032 Checksum alarm

Any help would be greatly appreciated. Thanks!

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Split from Sinumerik 840D Need Help.