its generally a problem with a non-CPU board or some other main component of the CNC unit.
The manual says "972 NMI OCCURRED IN OTHER MODULE. NMI occurred in a board other than the main CPU board.
Check what board is in slot 02
For 930 the manual says "The CPU Board is Faulty"
Similar errors can occur if communication between boards is broken. For example fiber optic cables etc.
First thing you should do while it still works is backup parameters, PMC params/ladder, SRAM, hidden macros etc etc. there are 1000's of posts on CNCZone where similar things happened and the person didn't have a backup and nothing but trouble resulted.