I'm not sure if it is the right forum to address my question. We have GE 9E frame gas tubines and as scheduled overhaul is on the horizon we are planning the jobs to be done. We suspect that misalignment is high between Gas turbine and generator bearings. We'd like to check it using laser alignment equipment. As per my experiance we need to uncouple the units to take the readings. However the timing of outage is short and coupling bolts are not availaable at site. GE specialists when we consulted them say that it is OK to check alignment without uncoupling units, on coupled machine. My concern is if the readings will be reliable in this case.?