Despite Surge in HELOC Deals New production of securities backed by various second-mortgage products slowed down last year despite a strong run of new transactions backed by home-equity lines of credit, according to a new market analysis by Inside MBS & ABS. The second-mortgage ABS market dropped from $11.61 billion in 1999 to $10.92 billion last year, a decline of 6.0 percent. Issuance was generally stronger after a