I was just going to point that out about the reed relay. It was always marked "pressurized-do not open". I think that pressure was the only safety hazard though, as in the risk of the thing blowing glass all over you if you tried to pry it open. I learned the hard way on one when I was a kid and I assure you, there was no green goo in it, just a coil of wire surrounding a glass tube containing two sets of reed contacts.

The 400D cards were Mil-Spec and I doubt very seriously that there is anything to be concerned over. I must agree with most people here that the goo is coming from an outside source, such as a water leak or a concentration of humidity in the area.

Ed Vaughn, MBSWWYPBX