Guys:
Here is Chuck's page on the problematic caps (including C-553)
http://classic-web.archive.org/web/20080112212428/www.r390a.com/ProbCaps.html
Here is the web address for Chuck's R-390A page:
http://classic-web.archive.org/web/20080212161221/http://www.r390a.com/
I hope this helps.
Joe Connor