TM 9-6115-670-14&P 4-105 4.40.  MUFFLER, (JTACS) MODEL MEP-903B and (WIN-T), MODEL MEP-903C. This task covers: a.  Service b.  Replace INITIAL SETUP Tools General Mechanic's Tool Kit (Item 1, Appendix B) Gloves, Mask, Chemical and Oil Protective (Item 34, Appendix B) Materials/Parts Equipment Conditions MASTER ON-OFF switch on APU control unit set to OFF. Engine stopped and allowed to cool completely. Muffler wrap removed (para 4.39.). Muffler (JTACS and WIN-T) Muffler Gasket (Item 7, Appendix J) SERVICE a.  Remove one bolt and lock washer (1) securing muffler (6) to muffler bracket (2), remove three bolts and washers (3, Figure 4-28) securing muffler (6) to muffler brace (4).  Remove muffler (6) and muffler gasket (5). b.  Clean muffler by mechanically removing carbon and fuel residues from input and exhaust pipe openings in muffler. c.  Reinstall muffler (6) and muffler gasket (5) to muffler brace (4) and secure with three bolts and three washers (3). d.  Secure muffler (6) to muffler bracket (2) with one bolt and lock washer (1). CAUTION Exhaust  pipe  wrap  contains  fiberglass.  Wear a long- sleeved shirt and gloves, and mask, when removing the muffler wrap. WARNING Do not use solvents to clean interior of muffler. WARNING DC    voltages    are    present    at    generator    set components.    Even  with  generator  set  shutdown. Avoid grounding self when touching any electrical components.  Failure to observe this warning can result in personal injury or DEATH by electrocution. NOTE Lengths  of  mufflers  vary  between  JTACS  and  WIN-T models.    They  are  attached  to  the  APU  in  the  same manner.