All the revelations this year about dubious practices in the mortgage servicing arena — think robo-signers and forged signatures — have rightly raised borrowers’ fears that companies handling their loans may not be operating on the up and up. But borrowers aren’t the only ones concerned about potential mischief. Investors who hold mortgage securities are increasingly worried that servicers may be putting their interests ahead of those who own the loans. A servicer might, for example, deny a loan modification to a borrower because it also owns a second mortgage on the same property and doesn’t want to write down that asset, as required in a modification. Levying outsize default fees is another tactic — the fees typically go to the servicer, not the lender, but they can still propel a property into foreclosure more quickly. And foreclosures aren’t a good outcome for investors. Last week, a jury in federal district court in Reno, Nev., awarded a group of 50 mortgage investors $5.1 million in punitive damages against defendants in a loan servicing case. Although the numbers in the case aren’t large, its facts are fascinating. Indeed, the case exposed some of the tricks of the servicers’ trade.