within my company we raise many tech services query notes( for some reason qa will not get involved ) which arrive on a small island in the Irish Sea on the desk of an unexperienced on type tech services engineer who will then try to teach the experienced line engineer how to suck eggs, with most query replies involve complying with the FIM. Talk about chimps!So I must agree with firkin , most of the time it is up to the discretion of the engineer to make the final judgement on whether or not to incur the wrath of qa, but at least we have a radio with which to contact the office to get the mm ref.