To paraphrase the opinions of the author of the Toronto Star article* , the faulty capacitors are suspected to have been rooted in the theft of an aqueous electrolyte formula which was not copied correctly. If you were to open up a capacitor you would find thin sheets of paper and metal rolled up together. The entire assembly is then wetted with an aqueous electrolyte solution. However, if the formula is not correctly mixed up, hydrogen gas can apparently build up in the aluminum can with time.
FULL STORY @ PCSTATS (http://www.pcstats.com/articleview.cfm?articleID=195)