Are you sure they are dead and not just playing possum? If you have a “bridge” problem, it could intermittently work like you are stating. It may have worked once and will never work again. Lack of phase coupling can cause X-10 to do some crazy things. Try plugging the module and transceiver on the same circuit (same outlet with a multi extension cord or on the same wall plate). Does it work there or is it really dead? If its dead and you killed 2, that’s interesting.
Chris