Usually, if a bulb works in one socket but not another, the problem is the second socket. Maybe you can raise the contacts in the socket with a jeweler's or eyeglass screwdriver. Test equipment that lies to you will send you off on wild goose chases, not to mention really pi**ing you off! Electrical testing can be tough enough if the testers are known good. And, yes I've made that mistake (and many others)!
BC
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