If you have the spare Sedra, try replacing the volute. If the impeller is wiggling because of sloppiness in the hole in the volute, the impeller may be rubbing inside and generating heat. If you still had the problem when you used a different impeller, then the pump body or the volute has to be the problem.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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