I checked it all. It's about a 1" section of the bead. Slow leaking.
Who mounted your new tire?
Just wondering, because I've seen several ST rims damaged (approximately one inch width) on the rim, from the shops using a tire iron to "start" mounting the tire with their machines.
The shops just don't seem to take the time, or care about the quality of work anymore, and just shove stuff on, often times, damaging the bead/cords/rims in the process.
I hope yours is simply a case that they didn't clean the rim off before they mounted the tire etc.