What was found
PASSENGER REPORTED #2 ENGINE EXHAUST FLAPPING IN FLIGHT. AIRCRAFT REMOVED FROM SERVICE. FOUND MISSING HARDWARE/SPRING CLIPS ON LOCATIONS M2, M3, A1, A2, A3, AND AFT MOST ATTACHMENT AS NOTED IN FIGURE 101 SHEET 1 OF Q400 SRM 54-45-25, TR 54-067. FERRIED AIRCRAFT FOR REPAIRS. REMOVED THE R/H AFT EXHAUST OUTLET IAW Q400 AMM TASK 78-10-26-000-801. BEGAN INSTALLATION OF REPLACEMENT AFT EXHAUST OUTLET IAW TASK 78-10-26-400-801, PARAS 1 THROUGH 5.D (5-11-22 3216) COMPLETED REMAINING STEPS OF AMM TASK 78-10-26-400-801 (PARA 5 E+F). RETURNED TO SERVICE.