Where are the photos. We want to see yor rig !!
Well done on getting the rig before Xmas.
Im not a Etec owner, but i would be changing the gear box oil and fuel filter at least annually. There is high performance gear oil available that is "meant" to last. But water is the biggest killer if it manages to seep in. Normal outboard gear oil is not expensive and you can get the little seal washers cheap too. Most fuel filters are under $20 and you can DIY.
I would be removing the prop at least annually to check for fishing line wrapped around the shaft (can cut the gear oil seals) and also grease the prop shaft.
+ other simple checks such as motor mounts, battery fluid level, battery terminals clean and tight, all fuel lines & connections, throttle and steering connections and just pop the cowling off to make sure everything looks in order (nothing working loose or come un-done) After a while you will get to know what goes where so you can spot any thing wrong.
If there are any grease nipples around, 1 (maybe 2) pumps or marine grease should be plenty.
Going to a dealer may be a bit of a waste ?. They will prob do something similar to the above, and maybe plug their computer in and have a look. It certainly wont hurt. But "apparently" its not required on these motors.
There is prob max 1 hrs work to do it yourself + a bit of shopping time. Its always good to be familiar with your rig incase you need to do minor running repairs if your stuck offshore.
cheers
Rod