first check the ocss log M-1-2-2-1 you will have some 1700 faults if its going NAV look what other faults you are getting around the same time , to check the date and time of a fault hit blue and up . Check the mcss log m-2-2-1 for shutdowns , or if it is happening all the time observe mcss status while running in M-2-1-1 . I don't think its load weighing as such but if its been like this from handover it could be a bad set up . If it happens all the time stick a 50 % load in there , go to m-2-1-2 on the tool and look at bottom right of screen which is the load percentage . Check that's right ( or close enough ) and do top to bottom runs using the buttons on the MRO panel so you can watch the read back from the load weighers.