I've just spent too long doing mine, both sides leaking. Also upgraded to vented discs and new calipers too.
The swivel seals are a bitch to get to. Do yourself a big favour and buy a snap-on 14mm long-series ring spanner. Don't get no cheap crap as it is oing to be worked to its limit getting the balls off the axle. I broke two lesser spanners trying.
In the end a simple job of replacing two £4 oil seals cost me over £350 notes, I also fitted new swivels as the old ones were pitted, then the brake discs, calipers, new driving members, new top pins and bearings, new brake hoses, flaring kit to make pipes up, loads of swearing, more swearing, grazed knuckles, caliper bolts, one-shot lube, loctite and some more swearing, the swivel-axle bolts are tight!