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I'm not an A&P, but I have SOME experience fixing 150 problems. One common problem is worn flap tracks. Lower the flaps and feel for slop. The next is the main landing gear box. A good indicator of its heatlth is to look at the row of rivets just below the landing gear leg. There's about 5 on each side. Are they making smoke? If so, it's probably a good idea to get it repaired, and may be an indication of other landing gear issues.