Followup: for the laffs (and for the Gipper), I decided to desolder a 327A / _72K from one of my 400D line cards.

This seemed to have the exact same type (327A) and same year (First quarter 1972, if I remember the WE dashed date codes correctly) relay as has been reported here and elsewhere. My 400D did not have the leaking problem.

But once I started de-soldering it (would not recommend, lol) apparently the heat caused the green goo to start squirting out of all 4 corners of the relay, as this sequence of photos shows:

[Linked Image from seriss.com]

[Linked Image from seriss.com]

Yep, there's yer problem. I love the sticky gooey detail in that second photo.
As I wrote on Phil's 1A2 facebook group, it's like dissecting a frog with taffy for blood.

One thing I haven't figured out is why my goo is a light green. Everything I've seen so far, the goo is typically a dark green, similar to the dark green solder mask on the 400D card, which by the way also turns into sticky goo when heated.

Anyway, thought you all would be interested -- I did it so you don't have to.
Would not recommend trying to repair these particular relays by de-soldering, unless you're prepared for a sticky, stinky gooey mess. Yuck!