While carrying out the pressure test in AD CF90-03-R2, large leaks were found in the area surrounding the muffler tailpipe area under the heat muff shroud support structure. No defects in this area were visible. Without the pressure test, this defect would not have been found. It is assumed the muffler is original to the airplane. Part total time: Unknown During flight, the carbon monoxide warning illuminated. Pilot returned to land. Maintenance discovered two spot welds on the shroud support flange of the muffler had failed, resulting in open holes in the muffler can. Muffler was replaced. Part total time: 212.0 hours While conducting the inspection required by AD CF-90-03 R2, found exhaust cracked at right hand inlet flange radius. Exhaust muffler, left-hand and right-hand exhaust header pipes were re- moved and sent to manufacturer for inspection and repair. Part total time: 50.0 hours.
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