THAT ALLOWS ELIMINATION OF 3617110-2 58 49-7541R1 IGNITION UNIT ADAPTER BRACKET.. SERVICE BULLETIN MOS MSC APU - INSTL NEW 3884980-38 3884984-3 STATIC/TOTAL PRESS TUBES HAVING DRAIN HOLES ADDED CLEANING PROC TO REMOVE ALL CONTAM. SERVICE BULLETIN MOS MSC SB 49-7561 APU - RPL TRBN SEAL GSKT P/N 3844707-1 WI 3844707-2. SERVICE BULL