Same thing happened when I bought my 09 3 years ago. It had 1040 miles on it and the dealer did a fluid change. Brought it home and a couple days later I seen oil under it. Sprayed brake clean on a rag and wiped off the area around and under the plug. Next day there was the drip. Whoever put the plug in split the o ring.
2009 Road Glide. 16 in Vindikta Wild Cats. Aquatic AV, Stinger 700X4 to MMats PA 601, Audiopipe horns.
Ground Zero 7X10 in the lids w/ sspn.4 1000d, tuned with DD Audio DSI-2. S&S 106, lifters, push rods and AC. Drago 2. CycleRama 575. Progressive monotones -1in. 12in. HD adjustable rear shocks. Painted inner fairing. Tuned with TTS. Blacked out!