As has been mentioned previously, it is a flight manual requirement for all three trims to be run through FULL deflection checking for free movement and lack of binding etc
Are you sure about that? My manual is old (last update 2004) but makes no mention of running the trims through their range to check for binding etc. The first mention of trims is the cockpit check prior to the walk around, and merely says to set the trims to "0". Prior to take off there are another four occasions when trim setting is called for to be checked. Page 45 of the report cites the same. In fact I've never seen a checklist that called for running the trims through their range to check their correct operation, binding etc.