The other $15,000 gets split between Tokuko ($6,000) and State Farm ($8,917.83). Tokuko's claim relates to some personal injury and property damage done by a bus in 2005, and State Farm's claim is unlitigated so we can't look up the details.
We were able to pull up this info with some help from SFist Rita and the Superior Court of California (County of San Francisco) web site, which is just about the clunkiest bit of technology we think we've ever seen. Oh no wait -- we nearly forgot about Muni's new site.