In TELECOM Digest V25 #206, sawney beane wrote (in part):
Some carriers use gel-filled jacks outside (at the demarc/NID) in coastal or tropical areas where high humidity and temperature tend to corrode connections. The gel helps exclude moisture and oxygen to prevent corrosion that degrades electrical connections.
The stuff I've encountered is similar or identical to the gel filling in so-called "ickyPIC" cable and serves a similar purpose. Like the stuff in the cable, I suppose the gel in the jack could congeal and/or migrate over time.
It shouldn't have disrupted the connection all by itself. Maybe the BellSouth tech unplugged the prem wiring plug for testing, and the congealed gel prevented the jack contact "whisker" from mating to the= plug contact when she plugged it back in.
I'd tend to discount the "conspiracy theory", though ...
Paul A Lee Sr Telecom Engineer Rite Aid Corporation WP-IS-COM (Telecomm) V: +1 717 791-64085280 Simpson Ferry Rd, Mechanicsburg, PA 17050 F: +1 717 791-6406 P.O. Box 3165, Harrisburg, PA 17105-3165 C: +1 717 805-6208