I'm not sure I see the point in a trigger job on a 709/740 unless there is something actually wrong with trigger function/operation. Normally, the purpose of a trigger job is to make the trigger smoother and to reduce trigger force. For a concealed-carry gun you really don't want a super-light trigger and I find 5-7 pounds force just about right. Some buffing (in the firing pin block and disconnector areas) may improve smoothness during the initial "take-up" but the actual trigger function is pretty crisp, at least on the older models; and they tend to smooth out as they are used, anyway. Finally, the sear slides on a bracket that appears to be MIM (not machined metal) so I doubt traditional trigger job techniques (e.g. stoning and polishing) would improve friction here. Besides, those surfaces are pretty inaccessible. Many guns have been ruined by bad "trigger jobs". Personally, if your trigger works OK now (reasonable, consistent force) I think any additional trigger work would be just asking for trouble.
Having said all that, I did have a problem with my 709 trigger; the trigger force was inconsistent (3-12 pounds at random) and the sear sometimes failed to catch the striker. In my case, adjusting the sear spring (to increase force on the sear) and cleaning fixed the problem.
