Rear axle leaking

[Wedgetail]

1940 Deluxe…. One of my rear brakes is completely soaked with gear oil from the differential. I drained the diff, and I got the drum off and now I’m not sure how to replace the axle seal. Can I pull the axle out? And if so, how? or do I have to take the banjo differential apart? I was assuming that the axle seal would be accessible from outside, but now I’m afraid it is a much bigger job.