well the problem should not be so complicated to trace
First of all the Fanuc 0-MC model let you see the ladder logic if the parameter 60.2 is enabled for ladder display
next ,from my experience with so many machines,i saw that the alarms logic are created at the end of the ladder logic so you could start bu tracing the alarm from the bottom of the ladder logic
if you have a number on this alarm just look from the bottom what line is active on the ladder when you have alarm on screen and what line goes down when you hit reset and the alarm dissapear
in this way you can trace the line taht generates the alarm,i know ,need some time but you can do it
after you find the line in ladder that generated the alarm,look what inputs are there,like X,i assume the alarm is generated by a senzor that needs to be read or a combination of the sensors
when you find the X inputs,you need to look in the electrical dagram ,what means that inputby name,eg:atc sensor home or whatever
Good luck
PS:make photos of all pages from ladder and send to me at:
[email protected] and i will have a look when i have time
i knwo will be like 80 -90 photos but if you do not have it printed is the only way