AD number NE-09-04 you can find a copy of it on the FAA website and here.
See engines affected by clicking Here.

NE-09-04 – Lycoming Engines – Precision Airmotive LLC RSA-5 series
NE-09-04 – Superior Air Parts, Inc. – Precision Airmotive LLC RSA-10 series
NE-09-04 – Teledyne Continental Motors – Bendix RSA-5 series
NE-09-04 – Fuel injection servos – Bendix RSA-10 series

Click Here to see more.