Sorry to hear about your difficulties.... but, this is easily solved.
I had typed up a nice long reply to your problem, but the forum software seems to have deleted it.....I guess.
I'll give you the short answer, those M-codes are defined by the machine builder, in this case Motionmaster, who is no longer in business. However, it is easy to determine which M-code it is.... simply go to the M-code table and look at the ones that are defined, and then through a process of elimination, you can easily determine which M-code it is. (The M-code table is located in Special modes and then press (2), (Going out of memory it is 2) This process will only take a couple of minutes.
Or you can contact the company below that specializes in Motionmaster repair and understands your system very well. The gentlemen named Eric at this company was an Engineer at Motionmaster at the time your machine was built and can easily help you.
I hope this helps !