Much to my surprise, Glock will give a commoner their armorer's course:
AC - Armorers course (1 Day)
Learn how to safely use and maintain your weapon in a one day (8 hour) class.
(To be eligible to take the Armorers Course you must be an active law enforcement or military officer, private security, GLOCK Stocking Dealer/Range Program Employee or current GSSF member.)
AA - Advanced Armorers Course (2 Days)
Two day (16 hour) class that goes beyond the basic armorers course and discusses advanced maintenance and service issues for the GLOCK pistol.
(Current armorers with at least 2 years experience are eligible for the Advanced Armorers Course (AA).)
Anything else, it is time to start calling the manufacturers.