T2i suddenly produces way over exposed images

About four years ago my friend bought the T2i with the 100 to 400 lens and the 1.4 extender. Until recently he loved that rig, but it suddenly started producing way over exposed images. He adjusted the exposure comp to two stops under exposed but still way to light. I should mention that he is a wildlife photographer and his equipment takes quite a beating. The camera has probably produced tens of thousands of images. He also is not on line. Any ideas that you may have that I can pass along to him? Thanks Chris

Ask your friend to manually set the Av to f/16... then while looking through the viewfinder, press the depth-of-field preview button.  This is the small button located on the front of the camera body just slightly below the lens-release button. If the lens and camera are working correctly, the aperture blades should be fully-retracted while looking through the camera, but when you press the DoF Preview button, the blades should constrict down to the f/16 aperture you dialed in.   The view through the viewfinder should suddenly become NOTICEABLY darker. If your lens aperture blades are not working, then it could explain why you'd have heavily over-exposed images even when dialing in exposure compensation. Try this with and without the extender. If the lens works as long as the teleextender is not being used (lens direct attached to body) then you've got a problem with the extender.  It has electronic contacts that are supposed to pass communication through to the body.  Contacts on the body-facing side should be gold coated plates.  Contacts on the lens-facing side should be gold plated pins (which are springy -- make sure you can press them and they spring back out -- nothing should be jammed.)   You can try cleaning but do NOT use anything abrassive (dont' use a pencil eraser, for example... that gold plating is thin and you'll take the plating off.)  Clean only with a soft cloth.  You can lightly moisten it if you want.    It's also possible the fault is inside and not related to the contacts. Also try a different lens.  If this only happens with this particular combination, then you've got a problem with the extender or lens or the extender.  If it happens regardless of what lens you use then you probably have a problem with the camera body. 

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