I'm the founder of one of the biggest mandolin groups on Facebook for Mandolin Players. As of this posting (5/31/18), we have over 1,000 members.
I've added two documents to the group's files. The first one is a database I'm building of Luthiers who specialize in Mandolin repair and restoration. The second one is a database of Mandolin Teachers.
If you know of any luthiers or teachers to add to either of these databases, please join the group and include them in the documents.
Thank you!