HST Leak from SwashPlate Side Cover

[Rip]

My F-3680 has had a minor hydro leak that just became major from the swash plate / trunnion shaft left (solid) side support cover plate. Probably the O-ring gone bad. Would be simple fix, but tight access/visibility inside the frame. Has anyone dealt with this in F-series or other B/BX machines and have any tips?? No joy finding info on YT.

 

[Rip]

Dealer got it fixed but did take all the disassembly I had figured.... and dreaded, but all good now! Took 1 1/2 mechanics over a day to accomplish.