Welcome to the forum!
Yep, at least change the filter.
Make sure the mating surface to the filter gasket is nice and smooth.
With filter removed, look very close to the surface of tranny above the filter.
The actual leak might look like it is coming from where the filter seals on the tranny but it might be coming from above and running down and around the filter.
Could be a leak at input shaft seal #47 or less likely #43 O-ring.
Filter screws onto #28 nipple.
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