Us fresh RE owners might check our drain plugs 'n' such after each oil change; ride for a while, and re-torque after the bike is cold. Just like doing a re-torque on a reassembled motor. I recall on the old forum a thread on drilling the bolts/plugs for safety wire, a damn good idea.
Similar on my C5 - went for 1st service "Oil Tight" - came back with a leak from one of the 2 small bolts - and they were dammed tight - so loosened to finger and then just thumb pressure on the spanner - so will just see how it goes
Ace hardware has all the right o-rings for the UCE engines. Just take your old ones and match them up with something a tiny bit thicker. Also our hosts sell 5 pack oil change kits that come with nice o-rings. Just don't overtighten the bolts.....as many others have cautioned against as well......that will only make things worse!GSS