I know Honda say the final drive is sealed and can't be repaired, but its easy to strip and replace parts. The outer seal on the wheel side is a 47mm outer diameter/ 35mm inner diameter and the part number is 91264-463-005.
Sounds like you just need a new seal. Easy enough task. No harm in having the bearings checked out while you are in there and maybe replacing the other 2 seals. BTW, if you go to an independent bearing & seal supplier I bet you will pay about half the Hondaprice (at most) for your seals.