Are there official documents? As far as I am aware these are the only words Porsche has put out in the public domain. Please correct me if I am wrong. 

Inspection of all 911 GT3 vehicles of model year 2014l
 
Stuttgart. The sports car producer Porsche is inspecting all engines of 911 GT3 vehicles of model year 2014. Porsche is informing the owners of the affected vehicles directly and recommending that they stop using their vehicles. The company is offering to pick up the vehicles and take them to a Porsche Centre immediately.
 
Safety is a number one priority at Porsche, and the company takes its responsibility seriously. After engine damage occurred in two vehicles in Europe and the vehicles then caught fire, Porsche decided to inspect all 785 delivered vehicles worldwide. There was no traffic accident and no personal injury. Internal studies to determine the cause of the engine damage have not been completed yet.
 
Porsche will report on any new findings immediately.
 
GO
 

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RS60 Spyder, 991 GT3 RS pending :)