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Yes, dismal indeed
Handy hint 1: Use the full model number (e.g. FH-T610) and "EV" as your search query. That got the spare parts diagram as first result. Then use the part number (Y4FL98090 in this case) as a search term, most of the time SJSC will be the first result if they have it.
Handy hint 2: With Shimano freehubs, the greatest weakness is being put up wet. They are not well sealed from the spoke end, and water in the rotor bearing will seize them up in a matter of days.
Dismally. The part number is Y4FL98090, although it's usually best to buy a new hub and perform transplant surgery, that way you get new bearings while you're at it.