08 Foreman 420 front differential, water intrusion

Recently acquired Craigslist 08 Rancher 420. Changed all fluids. Front axle oil was white with water, changed it, didn't do a flush, but oil drained for hours. Used in water this weeken, oil is white again. There isn't any oil leaking from the front end but obviously water in the oil. What are some possible points of intrusion that I should be troubleshooting to fix this. The breather tube seems intact and was above the water line. If a rebuild is necessary to replace the seals, what is the procedure for doing this and parts needed? Any and all thoughts and suggestions are welcome. Trying to get this fixed before duck season as I'll have it in the water a lot once that comes along.
Thanks in advance.
GW7