2-0333 R1 NO. 1 ENGINE - INTRODUCTION OF NEW AND REWORKED PS3 AIR TUBES AND TUBE NIPPLE. SERVICE BULLETIN MOS MRS/MSC - ENC SB 72-0333 R2 NO. 1 ENGINE - CORE MODULE AND FAN FRAME - INTRODUCTION OF NEW AND REWORKED PS3 AIR TUBES AND TUBE NIPPLE WITH SAFETY WIRE HOLES. SERVICE BULLETIN MOS HRSOASC - ENC SB 72-