Oil & Fuel Farmall 55 a leaking transmission fluid

[Wyomingite]

Hello, My first time posting. I have had a Farmall 55a for 4 years now. Love the tractor, but it recently developed a leak around the break shafts where they enter the transmission/rear axle. The boots under the little dust plate look fine and would be epic to replace. Has anyone else seen this and what did they do?
I've drained the fluid once and looked at everything. It all looked good and did not leak when I refilled it until I reconnected the brake shafts and put the parking break back on.
Any help would be appreciated.
Thanks!