Sure it wasn't mandated by the AMM procedure, but isn't it good maintenance practice to put switches and systems configured back to the way they are found?
Within the context of this thread, that is a ludicruous comment. Are we going to blame engineers for aircraft suffering loss of control because the flight crew failed to set the rudder trim properly?
The setting of any switch or control on any of the panels identified as under the responsibilty of the flight crew by the Boeing operational manuals, comprises the operational configuration for which the engineers have absolutely no responsibilty whatsoever.