Originally Posted by SleepNMnky
It's a general TSB, not under 2012 Impreza specifically.
Service Bulletin #12-142-12
Bulletin Description: This Bulletin provides a repair procedure to address a customer concern of a squeaking-type sound coming from the driver or passenger front seat back. The flat mat main support rods are covered in paper to prevent metal-to-metal contact with the backrest frame. However, if an edge on the backrest frame damages the paper, metal-to-metal contact will result, creating the squeak. Bushings will need to be installed to prevent the condition. This procedure eliminates the need to replace the backrest frame.
Sorry to hear but mine was fixed with no issues. The TSB helps.
I have an appointment for next tuesday