Rickcee, the trigger wires have changed, but that's not the issue. AFAIK, no problems have surfaced with Aliens of the age you have, so I'd say keep using them. But some folks seem to have lost all faith in them. I believe you can send them to CCH to get them tested. They did this to a bunch of recalled units (later production dates than yours) for no charge, but they might charge you a nominal fee.
Plus, there's a certain crazy user here who will buy them from you if you don't want them anymore.
His price is too low though.